Zhaohua Luo

• China University of Geosciences (Beijing)

The Bengge biotite aegirine‐augite syenite (BAS) is located in the southern part of Yidun Arc, eastern margin of the Tibetan Plateau area. It is an integral part of the Bengge ultrapotassic rocks (UPR), an alkalic complex mainly consisting of BAS, biotite pyroxene syenite (BPS), and biotite syenite (BS). Geochronological studies including zircon LA...

The Yamansu iron deposit, hosted in submarine volcanic rocks, is located in the Aqishan-Yamansu Fe-Cu metallogenic belt of eastern Tianshan, Xinjiang. New pyrite Re-Os, and pyroxene diorite intrusion ages and the chemistry of magnetite constrain the origin of the deposit. The Yamansu orebodies display banded or lenticular forms and sharp contacts w...

The Panzhihua layered intrusions is generated closely related to the Emeishan LIPs. This paper analyzes the spatial distribution of plagioclase and pyroxene. The quantitative texture analysis of 2209 plagioclase shows that the characteristic length of plagioclase is 0.54 to 0.96 mm, the intercept variation range is large, from ‐0.67 to 0.96, and th...

The volcanic rocks hosting the iron deposits in the Aqishan–Yamansu metallogenic belt are sodium-rich. The geochronology, petrography, and geochemistry of minerals and sodium-rich rocks as well as the relationship between these rocks and the iron deposits are studied. Geochemically, the ore-hosting volcanic rocks are sodium-rich (the averages of Na...

Models for the disruption of supercontinents have considered mantle plumes as potential triggers for continental extension and the formation of large igneous provinces (LIPs). An alternative hypothesis of top-down tectonics links large volcanic eruptions to lithospheric delamination. Here we argue that the formation of several LIPs in Tarim, Yangtz...

The magmatic system is one of the complex dynamic systems, which suggests that the evolution of magmatic systems has a multiple branching phenomenon, i. e. its evolving path includes a series of equilibrium processes and abrupt events. Consequently, the physical processes of magmatic systems are the key for understanding production and evolution of...

The primary characteristics of the key magmatic Cu-Ni sulfide deposits in the world are; ( 1 ) There is an obvious boundary between orebodys and country rocks, and orebodys always intruded into country rocks; (2) "sulfild melts" migrate and settle in the later stage of magma evolution; (3) all orebodys settle in the conduit of magma. Until now, no...

The Luming super large molybdenite deposit is a newly discovered Mo deposit with more than 890 thousand tons resource at an average grade of 0.084% in the Lesser Xing' an Range. Here we resolved the debate of the magmatism and associated mineralization of the Luming deposit. This paper reports LA-ICP-MS U-Pb zircon, Ar-40-(39) Ar biotite, and Re-Os...

Following the idea for proposing supereruption, a term to describe processes building up supervolcanos, we provide, in this article, a new term called as superintrusion to describe processes assembling batholiths. The article has a principal focus of why the giant ore deposits have formed immediately after supereruption or superintrusion. According...

The environment where the Permian Emeishan large igneous province (LIP) of Southwest China erupted remains controversial, especially regarding whether it was terrestrial, involving a 1 km scale domal uplift, or submarine. Slightly younger Daqiao conglomerate and Binchuan pillow lavas suggest that the Emeishan LIP erupted in a submarine environment....

Timing and source of several Fe-mineralized mafic-ultramaficintrusions in the Damiao area are investigated here by coupling new geochronological and Hf–Fe isotopic data with previous results. Although regarded as a Late Paleoproterozoic assemblage previously, two ∼140 Ma intrusions are recognized by zircon U–Pb dating, indicating emplacement of the...

Giant plagioclase crystals carried into the Panzhihua gabbroic layered intrusion from a deeper magma chamber can help constrain the timescales of emplacement of the Panzhihua intrusion in the Emeishan large igneous province (LIP). In this study, we present the petrographic textures and chemical compositions of giant plagioclase and fine-grained gab...

To constrain the paleoposition of the Tengchong block within Gondwana during the Early Paleozoic, we performed in-situ U-Pb and Hf isotope analyses on detrital zircons from Carboniferous strata in the Tengchong block. The age distributions yield dominant Neoarchean (~ 2.5 Ga), Mesoproterozoic (1.7-1.4 Ga), Grenvillian (~ 0.95 Ga), and Pan-African (...

According to the metallogenic theory by transmagmatic fluid (TMF), one magmatic intrusion is a channel of ore-bearing fluids, but not their source. Therefore, it is possible to use TMF’s ability for injection into and for escaping from the magmatic intrusion to evaluate its ore-forming potential. As the ore-bearing fluids cannot effectively inject...

: Tengchong Cenozoic volcanics that have record key information on the tectonic evolution and mantle features of the southeast margin of the Tibetan Plateau are of great importance because of its unique eruption history spanning the entire Quaternary period. Magma origin and evolution of Tengchong Cenozoic volcanic rocks were studied on the basis o...

Abundant megacrysts of clinopyroxene, amphibole, anorthoclase, and phlogopite are found together with deep-seated xenoliths in the Cenozoic basalt of the Tuoyun Basin, Southwest Tianshan. The megacrysts are mainly in the cone sheet formed at the early stage of the volcanic activity. Clinopyroxene megacrysts are located in the lower part of the prof...

1MO Xuanxue, 1LUO Zhaohua, 1DENG Jinfu,1YU Xuehui, 2LIU Chengdong, 1Yuan Wanming, 1Bi Xianmei 1China University of Geosciences, Beijing, 100083; 2Donghua University of Technology, Nanchang, 330013 Abstract: The East- Kunlun orogenic belt (abbrev. EKOB) is one of major tectono-magmatic belts in the Tibetan plateau. Four stages of granitoid plutonism...

: The Wurinitu molybdenum deposit, located in Honggor, Sonid Left Banner of Inner Mongolia, China, is recently discovered and is considered to be associated with a concealed fine-grained granite impregnated with molybdenite. The wall rocks are composed of Variscan porphyritic-like biotite granite and the Lower Ordovician Wubin'aobao Formation. LA-I...

Abstract This paper emphasizes that the interactive constraints of geology and isotopic dating is the best approach to construct the geological event sequence, and has compiled 106 data of reasonable isotopic ages for the igneous rocks of the Yanshan belt. We propose a sequence of mgmatic-tectonic events in the Jurassic-Cretaceous Yanshan orogen of...

One of the key questions attracted attention in the resource exploring field is the potential from an intrusion to produce metals. Hence determining the macroscopic indicators of ore-bearing intrusion and providing its theoretical interpretations are of the important responsibilities of scientific studies. However, due to the traditional petrology...

To clarify the relationship of the metamorphic intrusions along the west margin of the Yangtze craton and their metamorphic history after crystallization, the petrochemical and trace element geochemical characters, zircon SHRIMP U-Pb dating, and the chemical compositions of coexisting hornblendes and plagioclases from Neoproterozoic metamorphic int...

Ultrapotassic lavas having distinct geochemical compositions (K2O/Na2O > 2, K2O > 3%, and MgO > 3%) are common and widespread on the Tibet Plateau, where they are closely linked to N–S-trending normal faults. The Tibetan ultrapotassic rocks range in age from ~ 8 to 24 Ma, slightly older than the spatially associated potassic rocks (10–22 Ma). These...

The Tianheyong basalts are basanites, which at least can be subdivided into three types of mineral assemblages. In general, the Tianheyong basalts are characteristics of low silica (w(SiO2)=43.97%–45.68%), enriched alkali (w(K2O+Na2O) =5.91%–7.65%), enriched potassium (w(K2O)=2.04%–2.89%), high contents of titanium (w(TiO2)=2.18%–2.37%), high magne...

Based on field geology, petrographic characteristics, spatial and temporal distribution and isotopic dating of the Late Paleozoic-Early Mesozoic intrusions in the Qimantage Corridor of the East Kunlun orogenic belt, the authors have recognized five tectono -magmatic stages and five intrusive belts. Magmatism in this area can be divided into the Ear...

In this paper, the mantle melting column (Langmuir et al. , 1992) was introduced entirely. The trajectories unit paths of FeO-MgO and FeO-Na 20 in process of mantle sources adiabatically ascending and melting with different original pressure condition have been calculated by employing two different melting function, equilibrium melting and fraction...

The melt system and the ore-bearing fluid system can be seen as two independent geological systems according to the theory of transmagmatic fluid metallogenesis. They have coupled to form a complex mixing system because of their needs each other when the magma and ore-bearing fluids emplace up to the shallow level of crust. Decoupling between the m...

The Tianheyong alkaline basalts have only one layer from south to north and small volume, but have obvious diversity: at least three kinds of mineral assemblages. The major phenocrysts are olivine for all of the basalts, the center of the big zoning olivine phenocrysts have Mg of 89. 5 , the rim-Mg of 70. 3 , the small zoning olivines have Mg of 46...

Large scale granitic magmatism is commonly followed by emplacement of postorogenic dike swarms. These dikes swarms are characterized by a wide compositional spectrum and are volumetrically minor with respect to the associated granitic intrusions. Observations in the Taihangshan, Yanshan, Eastern Kunlun and Tianshan orogenic belts, show that dikes c...

The Cenozoic collision of the Indian-Asian continents has induced break-off of the subducted slab, the later has in turn triggered underplating of the mantle-derived magma, partial melting of the lower crust and production of the Gangdese batholiths belt and the co-batholithic porphyries. In this process, the underplated mantle-derived magma, the r...

We obtain the precise ages, 11Ma, of different rock types from the Taxkorgan alkalic complex, Middle East of Pamir syntax by using SHRIMP U-Pb zircon, which is consisted with the field evidence. 40Ar/39Ar dating of K-feldspar was also be used for this complex. Comparison between the two methods shows that the 40Ar/39Ar isochrone ages (23Ma and 13Ma...

The broadly intensive intraplate deformation and orogenesis in the China continent are usually considered as the distant effects of the force from plate convergent boundaries in traditional plate tectonics. However, there are not expected geodynamic relations between the intraplate orogenesis in the China continent and any convergent boundary. The...

Tuyon basin is a Cenozoic tectono-volcanic depression located in Southwest Tien Shan, Xinjiang, NW China. The volcanic rocks are mainly of basaltic composition and occur as cone dikes, lava sheets, caldera, volcanic necks and veins. Autoclastic breccia is very prevalent in lava sheets. Many deep-seated xenoliths are occurred in the cone sheets. It...

This paper is aimed at introducing and developing the principle of Metallogenic Theory through Trans-magmatic Fluids (MTTF) proposed by the Russian Kozhinskii's school. Some fundamental problems of metallogeny are discussed on geodynamic bases. In this theory, the trans-magmatic fluid is interpreted as a moving fluid passing through magma which is...

The post-orogenic dike complex is generated after cooling of its host batholiths, and may be a signature of the orogenic stress field transformation in an orogenic belt. Such dikes cropped out broadly in the granitic batholiths of early Mesozoic orogen, Kunlun Mountains, and late Mesozoic orogen, Taihangshan-Yanshan Mountains. These dikes can be su...

A suite of spinel peridotite xenoliths in Mesozoic basalts of the Tuoyun basin in the Tianshan area of northwest China has a high proportion of amphibole/mica-bearing lherzolites, with high Cpx/Opx ratios (mean 0.74). Many aspects of mineral chemistry in the Tuoyun peridotites are intermediate between those of refractory Archean cratonic mantle and...

Pamir syntax is one of the areas which have the most strongly tectonic convergence and largest crustal shortening in Tibetan Plateau. Taxkorgan complex, mainly composed of Kuzigan alkaline syenites and Karibasheng subalkaline granitoids, is the largest Cenozoic alkaline complex in the Pamirs region. Aegirine-augite syenite and syenogranite constitu...

There is a lot of magmatic zircon crystals in the Cenozoic alkaline basalt exposed in the Kangxiwar area of the northern Tibet. The SHRIMP zircon U-Pb dating (3.8Ma) reveals that the basalt generated in the early stage of Pliocene(Zanclean stage). Comparing with the typical basalts in the world, the Kangxiwar basalt characterized by enrichment of i...

This article summarizes the geological setting, spatial-temporal distribution, and major-element, trace-element, and Nd-Sr-Pb isotopic compositional variation of rocks representative of Tibetan postcollisional magmatic activity. The implications of petrogenesis and spatial-temporal distribution are discussed in relation to lithospheric mantle heter...

The granulitic xenoliths discovered in the late Cretaceous basaltic rocks from Tuoyun basin, western Xinjiang Province contain the assemblage of Opx + Cpx + Pl ± Grt ± Qtz ± Kfs. Mineral chemistry, petrochemistry and zircon U-Pb ages from the xenoliths have been reported in the paper. Petrogenesis, the lower crustal nature and the mantle-crust inte...

An analysis of major and trace element geochemistry and SHRIMP U-Pb zircon dating of mafic, intermediate, and felsic rocks from the Mianning metamorphic complex of Sichuan Province was conducted. One of our conclusions is that a majority of the zircons crystallized between 721 and 773 Ma in a magmatic regime. The complexes contain early to late Pal...

Triassic granites of magma mixing origin are widespread in the East Kunlun orogenic belt. They have the following common features: the composition of granites varies greatly; granites contain abundant mafic microgranular enclaves (MME); and different rock types tend to show gradational relationships. Particularly, these rocks co-exist with low-grad...

Chinese continental lithosphere comprises three tectonic domains: (1) eastern China, a region characterized by rifting, extensional basins, and voluminous basaltic volcanism; (2) central China, a plexus of cratonic terrains with low-heat flow (40–50 mw/m2), including the Tarim, Erdos, and Yangtze blocks welded by pre-Cenozoic orogenic belts; and (3...

Various shaped mafic microgranular enclaves (MMEs) together with several mafic massifs are developed within the Yuegelu granitoid pluton in the eastern part of the Eastern Kunlun. On the basis of detailed field geological surveying and of the results of the petrological and geochemical studies it is suggested that there must be some genetic relatio...

Widely spreading Cenozoic volcanic rocks in Tibetan plateau may provide insight into deep processes responding to the closure of Neo-Tethys and India-Asia collision. Three major Cenozoic volcanic events have been recognized as follows: (1) Collisional volcanic event aged from 65 Ma to 45 Ma, forming Linzizong volcanic belt, (2) Early post-collision...

The Parmir syntaxis is one of the most strongly deformatted areas in Tibetan Plateau. It underwent complex processes of formation and evolution. At the same time, it is one of the most developed regions in Cenozoic magma intrusions. There are extensive emplacements of magmas not only from crust, but also from mantle sources. Based on the researches...

This paper discusses inhomogeneity in structure of the present lithosphere underneath the Tibetan Plateau, and deduces the P-T-t paths and deep processes during the orogenic process of post India-Asia collision through revealing the nature and sequence of geological events. A three-stage-evolution model for tectonic phases of the Tibetan Plateau ha...

Geodynamic properties and evolution of the lithosphere on the north margin of the Tibetan Plateau are recently hot topics to geoscientists in the world. Have the northern plates been subducting underneath the Plateau? It is still an unsolved problem. One of the keys to solving this problem is to understand the genetic processes of Cenozoic magmas o...

Based on the LAM-ICPMS analytic results on the trace elements of clinopyroxenes in peridotitic xenoliths occurring in early-Cretaceous basalts from western Xinjiang, the properties and the deep processes, including partial melting and mantle metasomatism, of the subcontinental lithospheric mantle beneath the Tuoyun Basin are analyzed. In the northe...