Shuyun Cao

University of Salzburg · Department of Geography and Geology

Quantitative analysis is crucial for understanding the tectonic evolution of continental-scale shear zones. To unravel the deformation history and processes of a continental strike-slip shear zone, we examined a range of deformed rocks from the Chongshan shear zone (CS-SZ) on the southeast of the Tibetan plateau. The detailed field observations, mi...

The Xuelongshan metamorphic complex underwent Cenozoic sinistral strike-slip shearing and exhumation from deep to shallow in the southeast margin of the Tibet Plateau. We studied the deformation behavior and fluid action of quartz veins in the metamorphic complex in depth based on macroscopic observation, electron backscatter diffraction fabric, an...

A continental-scale strike-slip shear zone frequently presents a long-lasting deformation and physical expression of strain localization in a middle to lower crustal level. However, the deformation evolution of strain localization at a small-scale remains unclear. This study investigated <10 cm wide shear zones developing in undeformed granodiorite...

Continental‐scale strike‐slip shear zones often record significant tectono‐magmatism and dynamic deformation processes of the crustal lithosphere. However, the genetic relationships and timing among the anatexis, deformation, and initial shearing along a strike‐slip shear zone have not been well defined. Here, we carried out detailed field, microst...

Understanding the coupled process of deformed microstructure and fluid evolution of ore veins therefore provides insight into processes that influence mineralization distribution and its mechanism. Gold is often developed in quartz veins in many gold deposits. This paper presents detailed evidence for solid deformation, hydrothermal fluid, and mine...

Mineral carbonation of mafic–ultramafic rocks has been highlighted as a promising way for permanent carbon capture and storage. Carbonatization involves the release of Ca, Mg and Fe from silicate minerals by dissolution and reaction in the aqueous phase to form stable carbonate minerals. Diopside is one of the most abundant mafic minerals in the li...

The precise constraining of Proterozoic to Paleozoic tectono-magmatic processes of the orogen belt is important to understanding the evolution of the Proto-Tethys Ocean and assembly processes of Gondwana. This study presents newly defined Neoproterozoic to Paleozoic granitic gneiss in the Gaoligong orogen belt, western Yunnan, China, by using a com...

Formation and exhumation processes of metamorphic core complexes are critical to understanding large-scale extension, which accommodate activity of mid- to lower-crustal levels. Structural observations, kinematic criteria, microstructural fabrics and metamorphic histories need to be examined in great detail. Generally, a metamorphic core complex ha...

Tectonic pseudotachylytes have provided valuable insights into the evolution of seismic activity during crustal deformation. However, the origin and formation processes of pseudotachylytes are still debated. Thin pseudotachylyte veins were first recognized within the granitic mylonites of the continental exhumed Ailaoshan-Red River strike-slip shea...

Paleoproterozoic rocks are rare and essential for understanding the early evolution of the Yangtze Block. We present the newly defined Early Paleoproterozoic gneisses from the Yuanmou Complex at the western boundary of the Yangtze Block by a combined study of the structure, petrology, U-Pb age and Hf isotopic composition of zircons, and whole-rock...

A continental-scale strike-slip shear zone frequently presents a long-lasting deformation and physical expression of strain localization in a middle to lower crustal level. However, the deformation evolution of strain localization at a small-scale shear zone remains unclear. This study investigated

Multi-stage fluid influx has led to the volumetrically important occurrence of granite-related tourmalines at the Laojunshan metamorphic massif in Southeast Asia, which exhibits variable deformed structures and decomposition textures. These include disseminated tourmaline porphyroclasts (type-I), crosscutting tourmaline-quartz veins (type-II) and t...

Studies of crustal anatexis have provided valuable insights into the evolution of metamorphism, deformation, and tectonic processes at convergent plate margins during the orogeny. The transition of metatexite to diatexite migmatites records crucial information about the tectonothermal evolution and rheology of the deep crust. Along the Ailao Shan–R...

Lateral extrusion of blocks is a well-known geological process during continent–continent collision, which always expresses by either brittle strike-slip faults or ductile shear zones. However, vertical motion along such fault systems remains poorly constrained. The Gaoligong shear zone (GLG-SZ) formed the western boundary of the Indochina block du...

Middle-lower crust and mantle rocks are generally widely exposed in metamorphic core complex or gneiss dome, which is an ideal place to study the exhumation process related to regional extension and rheology. The Laojunshan metamorphic complex in southeastern Yunnan is located in a special tectonic position surrounded by the Cathaysia, Yangtze and...

Plutons within continental strike-slip shear zones bear important geological processes on late-stage plate transpression and continent-continent collision and associated lateral block extrusion. Where, when, and how intrusions and shearing along transpressional strike-slip shear zones respond to plate interactions, however, are often debated. In th...

Within-plate migration of alkaline basaltic centers is generally related to translation of the lithosphere with a hot spot above a largely stationary mantle plume. Here, we report, for the first time, a hitherto unrecognized migration of small-sized Late Miocene to Early Quaternary alkali-basaltic volcanic centers at the transition from Eastern Alp...

Eocene potassic magmatic rocks are abundantly developed in the Jinshajiang–Ailaoshan tectono-magmatic belt that stretches from eastern Tibet over western Yunnan to Vietnam. This study reports results from adakite-like potassic rocks from the Ailaoshan-Red River shear zone (ASRR-SZ) investigated by geochemistry, Zircon UPb geochronology, electron mi...

Graphitic carbon-bearing rocks generally occur in low-to high-grade metamorphic units. In many brittle faults, graphitic carbon is often associated with gouge or low-grade metamorphic rocks whereas in ductile faults, graphitic carbon commonly occurs in marble, schist or gneiss. Carbonaceous material gradually transforms from an amorphous into an or...

Mineral deformation and rock flow mechanism in the lithosphere are related to the rheological behavior and weakening mechanism of the continent. Natural deformation behaviors of feldspars are not well understood due to the complexity of their mineral compositions, crystal structures, as well as changing deformation conditions. The refined microstru...

The study discusses the presence, formation and destruction of graphitic material in fault rocks of exhumed fault zones. Because of the low strength, the presence of lubricating graphitic material along fault zones has important implications for understanding tectonic movements in various crustal levels. Fault zones are permeable for ascending and...

The Laojunshan massif is located near the southwestern margin of the South China craton, considered commonly as part of the South China Block. The Laojunshan gneissic granite together with Song Chay (in northeastern Viet-nam) granitic pluton constitutes a large granite dome. Some researchers have described it as a metamorphic core complex or metamo...

Metamorphism and deformation of Laojunshan granitic massif in Southeast Asian

Diancangshan metamorphic massif is one of the four metamorphic massifs developed along the Ailaoshan-Red River strike-slip fault zone, Yunnan, China. It has experienced multi-stage metamorphism and deformation, especially since the late Oligocene it widely suffered high-temperature ductile shear deformation and exhumation of the metamorphic rocks f...

The Cenozoic tectonic units in the Sanjing (Three Rivers) region, southeastern China, comprise, from west to east, three main crustal-scale strike-slip fault zones including the Gaoligongshan, Chongshan, and Ailaoshan-Red River. The Gaoligongshan strike-slip fault zone is the boundary between the Baoshan block to the east and the Tengchong block to...

We present a detailed case study of an exhumed continental strike-slip fault zone, the Ailao Shan-Red River (ASRR) strike-slip fault zone, to investigate how deformation promotes strain localization, and how the weak second phases and fluids trigger rheological weakening during retrogression near the ductile to brittle transition during exhumation....

The formation of major exhumed strike-slip faults represents one of the most important dynamic processes affecting the evolution of the Earth's lithosphere. Detailed models of the potential initiation, their properties and architecture of orogen-scale exhumed strike-slip faults, which are often subparallel to mountain ranges, are rare. The initiati...

Retrogressive deformation and metamorphism are often reported from the main low-angle shear zones and detachments of metamorphic core complexes, but their importance is not sufficiently emphasized for the footwall interior. In order to contribute to a better understanding of exhumation-related retrogression processes within and at the top of metamo...

Four metamorphic massifs in southeastern Tibet – the Xuelong Shan (XLS), Diancang Shan (DCS), Ailao Shan (ALS) and Day Nui Con Voi (DNCV) – have been suggested to constitute coherent parts of the Ailao Shan-Red River (ASRR) shear zone. This study details the cooling/exhumation histories of the crustal-scale shear zone by determining the cooling pat...

The Diancang Shan complex is one of the four metamorphic complexes along the Ailao Shan-Red River (ASRR) ductile shear zone. The complex experienced a long-lasting history of multiple deformation and metamorphism during its tectonic evolution since the Proterozoic. With the Cenozoic deformation- metamorphic evolution as the major topic of study, th...

Rechnitz window group represents a Cordilleran-style metamorphic core complex, which is almost entirely located within nearly contemporaneous Neogene sediments at the transition zone between the Eastern Alps and the Neogene Pannonian basin. Two tectonic units are distinguished within the Rechnitz metamorphic core complex (RMCC): (1) a lower unit ma...

We describe the structure, microstructures, texture and paleopiezometry of quartz-rich phyllites and marbles along N-trending Moutsounas shear zone at the eastern margin of the Naxos metamorphic core complex (MCC). Fabrics consistently indicate a top-to-the-NNE non-coaxial shear and formed during the main stage of updoming and exhumation between ca...

The Rechnitz window group represents a Cordilleran-style metamorphic core complex, which is almost entirely located within nearly contemporaneous Neogene sediments of the Pannonian basin at the transition zone between the Eastern Alps and the Neogene Pannonian basin. The western boundary of the South Burgenland High is a high-angle normal fault dip...

The Rechnitz window is part of Penninic window group exposed along the South Burgenland basement high within the large Neogene Pannonian basin, which is formed by changing the extension directions during the motion of the Alcapa block around the Bohemian foreland promontory. Based on new data of the structural history of Penninic units, its burial...

Structures of hangingwall units of major detachment systems in extensional settings leading to metamorphic core complexes are equally important to the generally well-studied footwall rocks. Here, we describe hanging-wall structures of the North-Cycladic Detachment System on Naxos Island of the Aegean Sea and found that they well monitor the structu...

The fabrics of metamorphic core complexes are characterized by the interplay between competing deformation and annealing by waning metamorphism on the one hand and by simple shear along upper margins vs. pure shear in the interior on the other hand. Here, we describe the microfabrics and textures of the Rechnitz window, which is actually a metamorp...

One of the apparently best investigated metamorphic core complexes all over world is that of Naxos in the Aegean Sea and numerous high-quality data on structures and microfabrics have been published. Among these structures is the Naxos-Paros ductile low-angle fault (Gautier et al., 1993), which is located along the northern margin of Naxos and whic...

The structural geology, timing of shearing, and tectonic implications of the ASRR shear zone, one of the most striking lineaments in Southeast Asia, have been the topics of extensive studies over the past few decades. The Xuelong Shan (XLS), Diancang Shan (DCS), Ailao Shan (ALS) and Day Nui Con Voi (DNCV) metamorphic massifs along the shear zone ha...

Exhumation of the high-grade metamorphic rocks from deep to shallow crustal levels in the Diancang Shan (DCS) massif is evident by the temporal transition from shearing and mylonitization at the amphibolite facies in the lower to middle crust, through retrograde ductile–brittle faulting at greenschist facies in the middle crust and brittle faulting...

The left-lateral strike-slip shearing along the Ailao Shan–Red River (ASRR) shear zone in the Southeastern Tibet, China, has been widely advocated to be a result of the Indian–Eurasian plate collision and post-collisional processes. The Diancang Shan (DCS) massif, which occurs at the northwestern extension of the Ailao Shan massif, is a typical hig...

The Diancang Shan metamorphic massif, the northwestern extension of the Ailao Shan Massif, is a typical metamorphic complex situated along the NW–SE-trending Ailao Shan–Red River shear zone. Diancang Shan granitic and amphibolitic mylonites collected from sheared high-grade metamorphic rocks were studied using petrographic and electron-backscatter...

: The Ailao Shan-Red River fault zone is the boundary between the Yangtze block to the northeast and the Indochina block to the southwest. It is an important tectonic zone due to its role in the southeastward extrusion of the Indochina block during and subsequent to the Indian-Eurasian collision. Diancang Shan (DCS) high-grade metamorphic complex,...

: The Ailaoshan-Red River (ASRR) shear zone is one of the major Southeast Asian tectonic discontinuities that have figured the present tectonic framework of the eastern Tibet. Several metamorphic massifs are distributed linearly along the shear zone, e.g. Xuelongshan, Diancangshan, Ailaoshan and Day Nui Con Voi from north to south. They bear a lot...

Abstract  The Liaonan metamorphic core complex (mcc) has a three-layer structure and is constituted by five parts, i.e. a detachment fault zone, an allochthonous upper plate and an supradetachment basin above the fault zone, and highly metamorphosed rocks and intrusive rocks in the lower plate. The allochthonous upper plate is mainly of Neoproteroz...

The ingot of Fe–(18−x)at%Ga–xat%Al (3≤x≤13.5) alloys was prepared from high purity elements using a high vacuum arc melting system. The X-ray diffraction patterns indicated that the alloys were disordered bcc A2 structure. The magnetostriction of the alloys was measured and the effect of partial substitution of Ga with Al on the magnetostriction of...

Fe-Ga thin films were prepared by DC magnetron sputtering on Si (100) substrate and an alloy target consisting of Fe81Ga19 was used. X-ray diffraction techniques were used to quantify the strain in the Fe-Ga thin films by measuring the interplanar spacings of select crystallographic planes. The interplanar spacing, d, for the family of Fe-Ga {211}...

Sheared amphibolite rocks from Diancang Shan high-grade metamorphic complex along the Ailao Shan-Red River shear zone, southwestern Yunnan, China, show typical mylonitic microstructures. The mylonites are characterized by porphyroclastic microstructures and the ultramylonites are highly lineated with alternating amphibole- and quartzofeldspathic do...

The ingot of Fe-(18-x) at% Ga-x at% Al (3

Diancang Shan metamorphic complex, lying to the northwest extension of the Ailao Shan-Red River shear zone, experienced very intense left-lateral strike-slip shearing and metamorphism. High-temperature mineral assemblages are preserved in sheared rocks and show typical high-temperature macro- and microstructure characteristics. A remarkable feature...

The microstructure and crystallographic preferred orientation (CPO) of quartz was quantified in natural monomineralic tabular veins deformed at ca. 500°C over a range of shear strains (gamma) from zero to about 15. The veins filled a set of early postmagmatic joints within the Adamello tonalite (Southern Alps, Italy) and localized homogeneous simpl...

The "Loftahammar-Linköping Deformation Zone" (LLDZ) in SE-Sweden is a prominent NW-SE striking dextral transpression zone within the Paleoproterozoic of the Baltic Shield. Amphibolite to greenschist facies ductile deformation within the LLDZ affected different kinds of felsic and mafic rocks and generated a wide variety of mylonites. "Augen mylonit...

The high grade metamorphic massifs (e.g. Xuelong Shan, Diancang Shan, Ailao Shan in China and Day Nui Con Voi metamorphic massif in Vietnam) along the Ailao Shan-Red River shear zone in Southwestern China bear much information on the large-scale left-lateral strike-slip shearing in eastern Tibet during Indian-Eurasian plate collision and post-colli...

Familial hypercholesterolemia (FH) is an autosomal dominant disorder of lipoprotein metabolism caused by mutations in the low-density lipoprotein receptor (LDL-R) gene, leading to elevated levels of cholesterol and an increased risk of coronary heart disease. In this article, from four homozygous FH phenotype probands we identified disease causing...

The electron backscattered diffraction (EBSD) technique is a brand-new technique of fabric analysis in modern structural geology. Its combination with the high resolution scanning electron microscope and energy dispersion spectrometer provides the possibility to perform a crystaUographic analysis of micron-to nano-scale particles in massive samples...

Microstructural, submicrostructuraland lattice preferred orientation ananlyses of hornblende porphyroclasts and matrix of amphibolitic mylonites formed in the middle crustal level from Diancangshan, western Yunnan, China New, give evidence for dynamic recrystallizationmainly controlledby a combinationof(IOO)[OOI]-twinningand dislocationgliding or c...

The structure, magnetic properties and magnetostriction of Fe81Ga19 thin films have been investigated by using X-ray diffraction analysis, scanning electron microscope (SEM), vibrating sample magnetometer and capacitive cantilever method. It was found that the grain size of as-deposited Fe81Ga19 thin films is 50–60 nm and the grain size increases w...

The Diancangshan complex, located at the northwestern extension along the Red River - Ailaoshan fault zone is constituted by three units with contrasting characteristics, a high grade metamorphic complex in the middle, Mesozoic low grade metamorphic volcanic-sedimentary sequence to the west, and a superimposed retrograde metamorphic belt to the eas...

The Diancangshan complex, located at the northwestern extension along the Red River - Ailaoshan fault zone is constituted by three units with contrasting characteristics, a high grade metamorphic complex in the middle, Mesozoic low grade metamorphic volcanic-sedimentary sequence to the west, and a superimposed retrograde metamorphic belt to the eas...

Based on the atomic model of rare earth-Fe2 (RFe2) compounds, the magnetoelastic model of Laves phase RFe2 compounds has been proposed and it can be used to explain the strain caused by both a magnetic field and a compressive stress. The magnetic field dependence of Young's modulus under different bias stress has been founded according to magnetoel...

OM (optical microscope)/TEM (transmission electron microscope) micro-and submicrostructural analysis of hornblende rocks sheared at high temperatures from the Diancangshan area, western Yunnan reveals evidence for deformation in the brittle-ductile transition of hornblende at middle crustal level (about 637°C and 0.653 GPa) and mechanisms of deform...

The Diancangshan (DCS) metamorphic core complex (mcc) along the Red River Fault Zone (RRFZ) is an incomplete mcc composed of two units with distinct characteristics, i. e. a lower plate of amphibolite grade tectonites intruded by synkinematic monzogranite, and a greenschist grade detachment fault zone. Lower plate rocks possess high temperature (hi...

A dynamic linearity model of the giant magnetostrictive actuator has been founded, based on the electro-magnetic theory and mechanical vibration principle. The model quantifies the relation between output displacement and input current by analyzing mechanical impedance of the Terfenol-D rod, spring and output shaft for the actuator. The output disp...

The structure, magnetization and magnetostriction of Sm(Zn 1-xTx) (T=Fe, Co) polycrystalline alloys were investigated by X-ray diffraction, vibrating sample magnetometer and standard strain gauge techniques. It is found that annealed SmZn1-xFex alloys show a single Sm(Zn,Fe) phase with the CsCl-type cubic structure when x≤0.2. SmZn1-xCox alloys are...

The structure, magnetization, and magnetostriction of R(Zn_1-xFe_x)(R=Tb, Dy) polycrystalline alloys were investigated by X-ray diffraction, vibrating sample magnetometry, and standard strain gauge techniques. It was found that TbZn_1-xFe_x consists of a single Tb(Zn,Fe) phase with the cubic CsCl-type struct...

In this paper, we report the magnetoelasticity of aligned polycrystalline Tb0.3Dy0.7Fe2 (Terfenol-D) magnetostrictive alloy in an actuator.

This article report on the effect of substituting other transition metals on the magnetostriction and Curie temperature of R(Zn1-xFex) (R=Tb, Dy) polycrystalline alloys. The X-ray diffraction analysis confirmed that the DyZn1-xFex alloys consisted of nearly a single Dy(Zn,Fe) phase with the CsCl-type cubic structure in the range 0

Through detailed structural analysis of Cenozoic deformation in the oblique collision zone between Indian and Eurasian plates, i. e. in the Three River region in eastern Tibet, three different structural styles are recognized. They are formed at different crustal levels in Cenozoic: 1) thin-skinned thrust faults and nappe structures developed from...

The structure, Curie temperature, and magnetostriction of Sm Zn1-x Mnx polycrystalline crystals were investigated by x-ray diffraction, vibrating-sample magnetometer, and standard strain gauge techniques. It is found that Sm Zn1-x Mnx alloys are nearly a single Sm(Zn,Mn) phase with the CsCl-type cubic structure up to x=0.2. The Curie temperature of...

Due to the inherent hysteretic nonlinearity, the giant magnetostrictive actuator (GMA) can cause position error in the open-loop systems, and cause instability in the closed-loop systems. To remedy this problem, a real-time hysteretic compensation control strategy combining a dynamic recurrent neural network (DRNN) feedforward controller and a prop...

Phase equilibria of the Tb–Dy–Zn system were determined in an isothermal section at 500 °C and vertical sections of TbZn–DyZn and (Tb0.4Dy0.6)0.6Zn0.4–(Tb0.4Dy0.6)0.45Zn0.55 by using optical microscopy, X-ray diffraction analysis, electron probe microanalysis and differential thermal analysis techniques. The isothermal section possesses nine single...

Recent studies on nano-materials in materials science revealed that nanomaterials may have fantastic features due mainly to size-effect of the materials. For example, nano ceramics may have very high ductility at room temperatures and pressures, even though normal ceramics is easily deformed by brittle fracturing. What and how much do we know about...

In this paper, a micro-position system is proposed and developed. This newly developed micro-position system contains a giant magnetostriction actuator (GMA), a digital control constant current source, a TMS320C31-based digital signal processor (DSP) position control board and a capacitive sensor. The digital control constant current source can be...

This paper shows a hysteresis model of giant magnetostrictive actuator (GMA), and proposes a hybrid genetic algorithm (HGA) to identify the parameters of the model. In the HGA, the trust region algorithm (TRA) is taken as a local search operator which parallels to the selection, crossover and mutation operators of a float-coded genetic algorithm (F...

Based on the Jiles-Atherton model and structural dynamics principle of transducer, the magnetoelastic dynamic strain model of giant magnetostrictive transducer was developed, which considered the eddy current losses and the variety of stress. Model simulations were compared with experiments at various drive levels and frequencies of operation. Simu...

The epoxy bonded Sm0.88Dy0.12Fe2 composites have been prepared. The dependence of magnetostriction, density, resistivity and compressive strength of epoxy bonded Sm0.88Dy0.12Fe2 composites on the proportion of binder, moulding stress and powder size is investigated. It has been shown that the proportion of binder, moulding stress and powder size ha...

Aiming at the weak capacity of climbing hill of genetic algorithm, a hybrid intelligent algorithm is established by setting the trust region algorithm in the genetic algorithm. In the proposed hybrid genetic algorithm, the trust region algorithm is taken as a genetic operator which parallels to the selection, crossover and mutation operators. The h...

The microstructure and magnetoelasticity of melt-spun Sm_1-xPr_xFe₂ and Sm_0.9Pr_0.1(Fe_1-yB_y)₂ alloys have been investigated using X-ray diffraction, transmission electron microscopy, three-terminal capacitance and standard strain gauge techniques. The microstructur...

The rare-earth iron giant magnetostrictive materials present more and more applications as a new type functional materials. In order to design magnetostrictive actuators, modelling of the input current dependence of output displacement for the actuator is necessary. Magneto-mechanical strong coupled model for a giant magnetostrictive actuator was f...