Metamorphism - Science topic

Several ultramafic enclaves found within the Eoarchean Itsaq Gneiss Complex (IGC) in southern West Greenland have previously been interpreted as representing mantle relicts. However, as Archean ultramafic rocks are frequently overprinted by metamorphism and late-stage metasomatism, it can be difficult to distinguish between peridotites representing...

The color is the primal property of the objects around us and is direct manifestation of light-matter interactions. The color information is used in many different fields of science, technology and industry to investigate material properties or for identification of concentrations of substances. Usually the color information is used as a global par...

The role of collisional belts in the global carbon budget remains controversial. Collisional orogens have traditionally been considered a net carbon sink, but recent studies have highlighted significant CO2 fluxes. The present contribution combines comprehensive field mapping with detailed petrography, pressure-temperature determination, geochemist...

Intermittent climate change episodes since the Late Pleistocene resulted in decreasing or increasing the earth's temperature causing the global sea levels to drop or rise accordingly. These episodes had a remarkable impact on landscape and soils in the Malay Peninsula. The peninsula is characterised by the presence of steep highlands in the central...

Implicit neural representation (INR) networks are emerging as a powerful framework for learning three-dimensional shape representations of complex objects. These networks can be used effectively to model three-dimensional geological structures from scattered point data, sampling geological interfaces, units, and structural orientations. The flexibi...

We developed a Handheld Integrating Sphere Snow Grain Sizer (HISSGraS) for field use to measure the specific surface area (SSA) of snow. In addition to snow samples, HISSGraS can directly measure snow surfaces and snow pit walls. The basic measurement principle is the same as that of the IceCube SSA instrument. The retrieval algorithm for SSA from...

We analyzed detrital and metamorphic zircon from three samples of paragneisses and one sample of neossome exposures in north of Rondônia state, Brazil. Samples were analyzed using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) techniques at the Geochronology Laboratory, Brasília University, Brazil. Main populations of detr...

Investigation of Hg isotope ratios of gold-related sulfides and penecontemporaneous mafic dikes from four orogenic gold provinces on the margins of the North China Craton and Yangtze Craton identifies three orogenic gold deposit (OGD) groups from different tectonic regimes. Ore-related sulfides of group 1 OGDs and mafic dikes from the craton margin...

In geological reports about the neighboring area of the Cerrejón coal mines, in Guajira department, Colombia, there are mentions of a thick sequence of metamorphic and sedimentary rocks, spanning since Precambrian to recent Neogene. The few references about magmatic rocks refered to Jura-triassic volcanics.

Along the strike of subduction zones, tectonic tremor episodicity is segmented on a geologic scale. Here, we study how this segmentation reflects large‐scale variations of the structure and conditions of the fault interface where tremor is generated. We try to understand which properties of the hydraulic system of the fault allow elementary tremor...

Geochronological data compiled for 29 major ophiolitic occurrences from the northern margin of the Indian plate precisely coincide with the three major mantle plume interactions over Indian plate (viz., Kerguelen at 130-110 Ma, Marion at 90-84 Ma, and Reunion at 65-70 Ma). We analysed i) the geological juxtapositions of the ophiolitic belts, ii) se...

The art of the Achaemenid Empire flourished in Ancient Persia from the 6th to 4th centuries BCE, and featured stone-carved monumental structures adorned with recurring zoological and floral patterns. Such representations clearly had a symbolic meaning intimately connected to religious expression and the will of deities. Considering the lack of any...

Extensive field work in central and southern Mongolia over the past few years shows that during the late Permian inertia-driven transtensive reactivation of primordial fracture zones gave rise to the development of a sequence of related yet disconnected fault-bounded sub-basins; some of these became the locus of substantial peat accumulation that e...

Corona textures, characterized by specific mineral assemblages as layers between existing phases, are frequently observed in high-grade metamorphic rocks. The mechanisms of corona formation have been extensively investigated, however direct dating of corona phases has rarely to be attempted. In order to decipher the timing and duration of corona fo...

Forests strongly modify the accumulation, metamorphism and melting of snow in midlatitude and high-latitude regions. Recently, snow routines in hydrological and land surface models were improved to incorporate more accurate representations of forest snow processes, but model intercomparison projects have identified deficiencies, partly due to incom...

Supply risk and economic importance are the key aspects controlling the metals classified as critical. Several of the critical metals are also classified as rare based on their restricted geological availability. In Europe, numerous mineralizations have been reported as being enriched in critical, strategic, and rare metals, and could potentially f...

Pickled mustard tuber (PMT), also known as Brassica juncea var. tumida, is a conical tuberous vegetable with a scaly upper part and a coarse fiber skin covering the lower part. Due to its highly distorted and complex heterogeneous fiber network structure, traditional manual labor is still used for peeling and removing fibers from pickled mustard tu...

Study object. Zircon from granitoids of the A- and I-types of the Neorchean Kola alkaline province of the Baltic (Fennoscandian) shield. Purpose. Determination of the rare-element composition of zircon in order to characterize the conditions of its formation in different types of granitoids. The use of these data together with the available results...

The use of NanoSIMS on primary melt inclusions in partially melted rocks is a powerful approach to clarify the budget of volatiles at depth during crust formation and its reworking. Anatectic melt inclusions are indeed gateways to quantify H2O, halogens and other species (e.g. CO2, N) partitioned into the deep partial melts generated during metamor...

Talc is widely distributed in metamorphic and hydrothermally altered rocks, and its velocity is useful for constraining the velocity of mantle wedge. In this study, we used ultrasonic interferometry to study the elastic properties of talc polycrystalline samples at high pressure (up to 5.6 GPa). VP increases monotonically with increasing pressure,...

While the adoption of green tourism and its associated eco-conscious marketing strategies represents a commendable stride toward fostering ecological equilibrium in the enchanting tourist havens nestled at the core of Galle City, a perplexing veil of obscurity envelops the realm of green marketing, notably within the distinctive context of burgeoni...

Though typically associated with a single folded state, globular proteins are dynamic and often assume alternative or transient structures important for their functions. Wayment-Steele, et al. steered AlphaFold2 (AF2) to predict alternative structures of several proteins using a method they call AF-cluster. They propose that AF-cluster "enables AF2...

The studied area is located in the high Zagros zone and it is considered a part of the Neyriz ophiolite. In this area, the ophiolitic complex is a small coloured melange including radiolarite cherts and serpentinized peridotite rocks. The peridotite rocks are mostly serpentinized harzburgite. The peridotite rocks are mostly serpentinized harzburgit...

This contribution analyses the structural architecture and tectono-metamorphic evolution of Briançonnais units in the southern French-Italian Western Alps. The studied area extends from a virtually non-metamorphic area adjacent to the Helvetic-Dauphinois External Domain in the west to the Monviso-Queyras ocean-derived units in the east, where metam...

As part of the work, studies of the rock’s permeability to gases were carried out using the original measuring apparatus, which makes it possible to study gas seepage through a porous medium under confining pressure conditions corresponding to in situ. Samples of selected sandstone, sapropelic coal, marble, granite, limestone, and spongiolite rocks...

Metabolism, known to be temporally regulated to meet evolving energy demands, plays a crucial role in shaping developmental pace. Recent studies have demonstrated that two key proteins PARP1 and PARG play a regulatory role in the transcription of both morphogenic and metabolic genes. Intriguingly, in Drosophila, the depletion of PARP1 or PARG prote...

This study focused on aggregates from the geological formations of the Alfallé massif located approximately 75km east of the town of N'Goura, in the Hadjer-Lamis Province (13°N, 17°E). The aim of this study is to determine the petrographic and geotechnical characteristics of these aggregates with a view to their recovery. Petrographically, the mass...

During the depletion development of condensate gas reservoirs, when the formation pressure drops below the dew point pressure, the condensate oil and natural gas systems are in the non-equilibrium state of foggy retrograde condensation. The rational use of the non-equilibrium phase characteristics of the foggy retrograde condensation phenomenon dur...

High enthalpy SuperHot Rock (SHR) Engineered (or Enhanced) Geothermal Systems (EGS) (>375 °C) are gaining recognition as one of the most promising paths to scale clean, firm, cost-competitive geothermal electricity production worldwide, but significant scientific and development uncertainty surrounds these potential high-value resources. In this pa...

Short‐wavelength infrared (SWIR) photodetectors are of great interest owing to their unique advantages of SWIR imaging such as better penetration ability and improved sensitivity that allow high‐resolution imaging. Commercially, extended InxGa1‐xAs heterojunction detectors with cut‐off wavelengths beyond λc = 1.7 µm are incorporated into SWIR image...

Lead isotopic data implies that thorium and uranium were fractionated from one another in Earths early history; however, the origin of this fractionation is poorly understood. We report new in situ Pb isotope data from orthoclase in 144 granites sampled across the Archean Yilgarn craton (Western Australia) to characterize its Pb isotope variability...

Landslides pose a significant threat to buildings, the population, road networks, and various infrastructures. They are a common occurrence in the Algiers region, which is the focal area of our study, exhibiting obvious signs of instability such as pavement and building cracks. This instability can be attributed to the region's geological compositi...

Reaction rims contain a wealth of information that can be used to decipher the P-T-t-X history of metamorphic and metasomatic rocks. One of the most important parameters that controls reaction rim growth is the presence of volatiles, which can affect rim thicknesses, phase stabilities and the development of rim microstructures. In this study, react...

The paper presents authors’ original detailed data on rocks of the Archean Pon’goma-Navolok charnockite−enderbite complex in northern Karelia. The rocks practically have not been modified and are preserved within a rigid block among Paleoproterozoic zones of ductile deformations and metamorphism. The geochemistry of the rocks and their isotope−geoc...

The total air content (TAC) of polar ice cores has long been considered a potential proxy for past ice sheet elevation. Recent work, however, has shown that a variety of other factors also influence this parameter. In this paper we present a high-resolution TAC record from the South Pole ice core (SPC14) covering the last 54 000 years and discuss t...

Metamorphosis is a critical process in the life cycle of most marine benthic invertebrates, determining their transition from plankton to benthos. It affects dispersal and settlement and therefore decisively influences the dynamics of marine invertebrate populations. An extended period of metamorphic competence is an adaptive feature of numerous in...

The Bohemian Massif in the eastern Variscan Orogen is the host of globally significant ultrahigh-pressure metamorphic rock suites that experienced enigmatic unroofing processes. In the eastern Bohemian Massif, the Moravosilesian Culm Basin (The Czech Republic) with ≤7.5 km thick Lower Carboniferous sili- ciclastic turbidities has recorded crustal u...

Dependence on the internet and computer programs demonstrates the significance of computer programs in our day-to-day lives. Such demands motivate malware developers to create more malware, both in terms of quantity and variety. Researchers are constantly faced with hurdles while attempting to protect themselves from potential hazards and risks due...

There has been a long debate regarding the timing of the final amalgamation of the North China Craton, which is considered to have occurred either during the Neoarchean or Paleoproterozoic era. One major point of contention is whether there existed a long-lived subduction lasting through the Neoarchean to Paleoproterozoic. The Lüliang Complex conta...

Analyzing black jadeite variety not only helps to distinguish it from the more common omphacite jadeite, but also helps to study the origin of jadeite by studying these special specimens. The basic gemological properties, mineral composition, structural characteristics, spectroscopic features, and color-causing mechanisms of black jadeite were stud...

Central Dronning Maud Land (cDML) is part of the late Mesoproterozoic Maud Belt in East Antarctica, which was metamorphosed and deformed during the Ediacaran–Cambrian Gondwana assembly. Here we study high-pressure (HP) mafic rocks in Gjelsvikfjella, cDML, which occur as lenses and pods transposed in highly strained, upper amphibolite-facies gneisse...

The presence of eclogite marks high‐pressure metamorphism and deep, cold burial of crust, and is therefore a widely accepted indicator for the onset of modern‐style plate tectonics. However, eclogite is rarely preserved in many heavily granulite‐overprinted orogens, which are particularly common across ancient metamorphic terranes (i.e., Archean an...

It remains unresolved whether extensive granitoids can originate from ultrahigh‐temperature crustal anatexis beyond the stability of fusible hydrous minerals and, if any, how they are generated and characterized. Here we investigate near‐anhydrous garnet granitoids in the Jining Complex, North China, using bulk‐rock and mineral analyses combined wi...

This is a presentation on prograde and retrograde metamorphism.including some basic information on metamorphism,descriptions on two types of metamorphism and their differences.

There is an ongoing debate on the processes producing background seismicity and deformation transients across seismic gaps, i.e., regions that lack historical large-magnitude earthquakes. Essential missing elements are geophysical images that resolve sources of geophysical unrest. Here, we apply seismic scattering and absorption tomography to data...

ABSTRAK Pembangunan jalan tol Jogja-Solo telah menorehkan onggokan batuan metamorf yang baru tersingkap dan dapat dijadikan kajian penelitian. Sebongkah singkapan skis terdapat pada urukan pengupasan bukit di daerah Jiwo Timur di timur sungai Dengkeng. Adapun kajian penelitian yang spesifik mengenai skis grafit belum pernah dikaji secara jelas baik...

The Jiangnan orogen, one of the largest gold-producing areas in China, has experienced multiple orogenic events with complex structural overprinting that is marked by multiple stages of magmatism, deformation, metamorphism, and orogenic gold mineralization. Different orogenic events have been recognized in the Neo-proterozoic, mid-Paleozoic, Triass...

Temperature gradient metamorphism in dry snow is driven by heat and water vapor transfer through snow, which includes conduction/diffusion processes in both air and ice phases as well as sublimation and deposition at the ice-air interface. The latter processes are driven by the condensation coefficient α, a poorly constrained parameter in literatur...

Geological evidence has demonstrated the presence of an intra−Neo-Tethyan subduction system during the Cretaceous. However, when and how this intra-oceanic subduction was initiated, especially for the eastern Neo-Tethys, are still not well constrained. Here we present geochemical and geochronological analyses of the Indawgyi mafic rocks from the Ce...

Orogenic sutures are mega lineaments that mark the limit between tectonic active plates with different genesis as a result of terranes collage. These zones are characterized by high strain, high grade metamorphism and/or ophiolite complexes. On aeromagnetic maps these sutures are normally well represented by lineaments with high positive anomalies....

The Nanpanjiang basin hosts the world’s second-largest concentration of Carlin-type gold deposits. To decipher the origin and evolution of hydrothermal fluid, this study conducted Sm–Nd dating, in-situ trace element, and C-O-Sr isotopic analyses on three types of calcite samples from the giant Lannigou gold deposit in the Nanpanjiang basin, SW Chin...

This paper aims at establishing type and nature of basement in Cauvery basin. The Basement rocks of Cauvery Basin are high grade regional metamorphic rocks of granulitic facies namely banded quartzo feldspathic micaceous garnetiferous gneisses and migmatitic gneisses. Structurally they are alternating bands of coarse grained Felsic (Quartz+feldspar...

Permian Ben Giang‑Que Son and Triassic Van Canh granitic rocks are widely distributed across the southern Kontum Massif, the basement of which consists mainly of metasedimentary rocks. The Ben Giang‑Que Son granitic rocks are classified as I‑ to S‑type and ilmenite‑series granitic rocks, while the Van Canh granitic rocks are classified as I‑type an...

The research location is in Ketukah, Gayo Lues Aceh, which is composed of the Late Oligocene to Early Miocene Rampong Formation. Lithology includes sandstones, conglomerates, and mudstones. The study aims to determine the origin of the sandstones in the Rampong Formation. Provenance studies are beneficial in providing information for oil and gas ex...

The water isotope composition of the winter snow cover on Arctic sea ice is strongly enriched in heavy isotopes near the snow-sea ice interface, incompatible with typical enrichment values through snow metamorphism processes alone. Our stratigraphic investigations from the MOSAiC expedition, using computed tomography combined with isotopic analyses...

This study investigated the relative efficacy of interleaved versus blocked instruction and the role of executive function in governing learning from these instructional sequences. Eighth grade students learned about three rock concepts (igneous, sedimentary, metamorphic) and their attributes (origin, texture, composition). Consistent with prior st...

Fluid-driven reactions are common in the upper crust, leading to mineral replacement and element redistribution on a kilometer to a micron scale. One common fluid-induced reaction is the chloritization of biotite. Chloritization can lead to the production of multiple phases, such as K-feldspar, titanite, and rutile, depending on local chemistry and...

Ransomware is a serious security concern to mobile devices, as it prevents the use of the device and its contents until a ransom is paid, resulting in considerable financial losses for both people and corporations. The existing anti‐malware measures have shown to be inadequate in combatting new malware variants that utilize advanced evasion strateg...

We present the 1:8000 scale geological map of the northeastern sector of Mykonos Island, where an igneous, metamorphic and siliciclastic sequence is cut by the North Cycladic Detachment System (NCDS), and brittly-ductily deformed during the emplacement of the Mykonos Granite. We describe the architecture of the (ductile) Livada and (brittle) Mykono...

New U–Pb ages of detrital and igneous zircons of the Uppermost Unit of Crete shed light on its provenance and on Eohellenic to Eoalpine imprints in the eastern Mediterranean. The detrital zircons of all nappes show Variscan ages and are characterized by a Minoan-type age spectrum, which is typical for the NE margin of Gondwana. Parts of the metased...

Fluid inclusions in high- and ultrahigh-pressure metamorphic rocks provide direct information on the composition of the fluids that evolved during metamorphism and fluid-rock interactions in deep subduction zones. We investigate the fluid inclusions in the Khungui eclogite of the Zavkhan Terrane, Central Asian Orogenic Belt. Fluid inclusions are ob...

Research subject . Zircon from granitoids of the A- and I-types of the Neorchean Kola alkaline province of the Baltic (Fennoscandian) shield. Aim . To determine the trace element composition of zircon in order to characterize the conditions of its formation in different types of granitoids. To use these data, along with the available results of U-P...

Research subject . Gravelites and conglomerates of the Upper Carboniferous and Permian of Western Taimyr. Aim . To reveal features of the petrographic composition of coarse clastic rocks and, on this basis, to clarify the ideas about the composition and position of the feeding province of the western part of the Taimyr sedimentary basin in the Late...

The Triassic Baikouquan Formation in the slope area of the Mahu Depression is the largest glutenite reservoir in the Junggar Basin, with low porosity and permeability; however, its physical properties are poor, the distribution of oil and gas is quite different, and the output fluctuates greatly. It is of great guiding significance to study the sen...

Most of the tectonic, metamorphic and geochronological data suggest that the Himalaya is essentially the consequence of a single orogenic cycle associated with the India-Asia collision during the Cenozoic era. Therefore, metamorphic assemblages and tectonic structures across the Himalayan range are systematically considered as post-collisional geol...

Near-Earth asteroid (3200) Phaethon exhibits activity during its perihelion passage at 0.14 au from the Sun and is the likely parent body of the annual Geminid meteor shower. Its low albedo and featureless B-type reflectance spectrum indicate a primitive composition, but a definitive meteorite analogue is currently indeterminate. Here we analyse a...

A mineralogical survey was conducted in the Gulf of Guinea sands to assess the transport history, depositional environment, weathering conditions and, provenance. Heavy mineral assemblages are abundant in augite, followed by opaque minerals, diopside, zoisite, enstatite, tourmaline, zircon, rutile, sillimanite, garnet, apatite, hornblende, epidote,...

The Variscan belt of Europe recorded a long period of reorganization from the late Carboniferous to the middle Permian that coexists with the final assembly of the Pangea and its early dismantling. We have undertaken 3D tectonic reconstructions by considering structures, magmatic and metamorphic evolutions, and modern paleo-geodynamic reconstructio...

We present the Hellenic orogenic belt`s main geological structure and architecture of deformation, trying to reach a better interpretation of its geotectonic evolution during the Alpine orogeny. We based on our recent studies and experience about the deformational history of the Hellenides but also on the more modern views, published by other colle...