Metamorphic petrology and geology in China: A review

Geng, Yuansheng; Qihan, Shen; Song, Huyue

doi:10.31035/cg2018012

Cited by 4 publications

(3 citation statements)

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“…The most widely distributed rocks in the BTB are the Archean metamorphic Bayanwula Group and granites. The Bayanwula Group is composed of amphibolite‐facies rocks, which have been retrogressed into sericite‐chlorite‐hornblende schists and albite‐chlorite schists because of strong deformation, and the recently obtained isotopic data suggest that these rocks are Palaeoproterozoic in age (Geng et al, 2007; Li et al, 2004; Shen et al, 2005; Wu et al, 2014). While, the granites distributed in this belt mainly formed during ca.…”

Section: Geological Settingmentioning

confidence: 99%

Mid‐Mesozoicto Cenozoic multiphase deformation in the Bayanwula Tectonic Belt, northern China

et al. 2022

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The Bayanwula Tectonic Belt (BTB) is located between the Alxa Massif and the Ordos Basin in the northwestern North China Craton (NCC). The Mid-Mesozoic to Cenozoic deformation characteristics of the BTB is crucial for understanding the tectonic processes of eastern Asia during that time. Together with the regional geology, our field observation and structural analysis reveal that the BTB has undergone three phases of deformation since the Late Jurassic. The first phase of deformation (D 1 ) is represented by NE-SW-striking thrust faults involved in the Jurassic strata, indicating a phase of NW-SE shortening deformation. Based on the combination of angular unconformity between the Upper Jurassic and Lower Cretaceous strata, the timing of D 1 is constrained at the end of Jurassic and dynamically related to the westward subduction of the Palaeo-Pacific Plate during the end of the Jurassic. The second one (D 2 ) is characterized by the NE-SW-striking normal faults and Lower Cretaceous syn-sedimentary strata on both sides of the BTB, which show that a phase of NW-SE extension deformation occurred in the Early Cretaceous, dynamically related to the rollback of the Palaeo-Pacific Plate in the Early Cretaceous. The third stage of deformation (D 3 ) is represented by the NW-SE-striking folds that involved the Pliocene strata, as well as dextral strike-slipping of the East Bayanwula Fault and the West Helanshan Fault, indicating a phase of NE-SW shortening at the end of the Pliocene. Dynamically, the D 3 is related to the outward expansion of the Tibetan Plateau.

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Section: Geological Settingmentioning

confidence: 99%

Mid‐Mesozoicto Cenozoic multiphase deformation in the Bayanwula Tectonic Belt, northern China

et al. 2022

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“…Ophiolites are generally missing from these orogenic belts, although fault-bounded slivers of mafic and ultramafic rocks, which have no meltresidua geochemical kinship or similar age brackets, occur in mélanges of subduction channel origin or in accretionary complexes (Isozaki et al 1990;MacPherson et al 1990;Terabayashi et al 2005;Langenheim et al 2013;Ogawa et al 2014). On the other hand, the latitudinal Tethyan orogenic belts exhibit well-defined suture zones with 5-10-km-thick, mostly suprasubduction zone (SSZ) ophiolites derived from the upper plates of N-dipping subduction zones (Dilek & Eddy, 1992;Dilek & Flower, 2003;Dilek et al 2007;Dilek & Furnes, 2009), thin or near-absent accretionary prism complexes and ultrahigh-pressure metamorphic rocks (Jolivet et al 2003;Geng et al 2018;Rehman et al 2018). The occurrence of complete, Penrose-type ophiolites (see Dilek, 2003a for definition) and ultrahigh-pressure metamorphic belts in those Tethyan orogenic belts was a result of the collisions of continent-facing, young (< 10 Ma in age) arc-trench systems, followed by the subduction and then exhumation of down-going continental margins, respectively (Dilek, 2003a).…”

Section: Introductionmentioning

confidence: 99%

Subduction zone processes and crustal growth mechanisms at Pacific Rim convergent margins: modern and ancient analogues

Dilek

Ogawa

2020

Geol. Mag.

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Continents grow mainly through magmatism, relamination, accretionary prism development, sediment underplating, tectonic accretion of seamounts, oceanic plateaus and oceanic lithosphere, and collisions of island arcs at convergent margins. The modern Pacific–Rim subduction zone environments present a natural laboratory to examine the nature of these processes. The papers in this special issue focus on the: (1) modern and ancient accretionary margins of Japan; (2) arc–continent collision zone in the Taiwan orogenic belt; (3) accreting versus non-accreting convergent margins of the Americas; and (4) several examples of ancient convergent margins of East Asia. Subduction erosion and sediment underplating are important processes, affecting the melt evolution of arc magmas by giving them special crustal isotopic characteristics. Oblique arc–continent collisions cause strong deformation partitioning that results in orogen-parallel extension, crustal exhumation and wrench faulting in the hinterland, and thrust faulting–folding in the foreland. Trench-parallel widths of subducting slabs exert major control on slab geometries, the degree of coupling–decoupling between the lower and upper plates, and subduction velocity partitioning. An initially large width of the subducting Palaeo-Pacific Plate against East Asia caused flat subduction and resistance to slab rollback during the Triassic Period. These conditions resulted in shortening across SE China. Foundering and delamination of the flat slab during the Early Jurassic Epoch led to slab segmentation and reduced slab widths, followed by slab steepening and rollback. This pull-away tectonics induced lithospheric extension and magmatism in SE China during Late Jurassic – Cretaceous time. Melting of subducted carbonaceous sediments commonly produces networks of silicate veins in CLM that may subsequently undergo partial melting, producing ultrapotassic magmas.

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“…Metamorphic facies is metamorphic rock group with similar condition which is characterized by a group of permanent mineral. According to Geng et al (2018) facies metamorphism in China is the outlined of the metamorphic rock map zone.…”

Section: Introductionmentioning

confidence: 99%

The Facies and Metamorphism Types Determination of Metamorphic Rock in The Part of Mekongga Complex

Musnajam¹,

Karim²,

Nurfadillah³

et al. 2020

Geos. Ind.

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Lambolemo Village is geomorphologically dominated by hilly slopes morphology. Lithology in the form of metamorphic rocks are mica schists and chlorite schists. The present research aimed to determine the facies and metamorphism types of metamorphic rocks in Lambolemo Village. The research methods engaged were field observation and laboratory observation utilizing petrographic analysis. Observations stage generated texture data and set of mineral both macroscopically and microscopically. The minerals were discovered within metamorphic rock of the research area, namely: muscovite, quartz, biotite, and chlorite. These findings then classified into two zones, there were chlorite zone and biotite zone. These zones were embodied into greenschist facies with chlorite mineral index. The greenschist facies was characterized with chlorite, albit, epidote, and actinolite minerals appearance. The metamorphic rock had a foliation structure. The structure was commonly generated by a regional metamorphic process, which was particularly a feature of the clear alignment, translucent minerals from flat minerals, such as : mica, chlorite and minerals that obtained fibers or scents. Keywords: Determination; Facies; Metamorfism Type Copyright (c) 2020 Geosfera Indonesia Journal and Department of Geography Education, University of Jember This work is licensed under a Creative Commons Attribution-Share A like 4.0 International License

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Metamorphic petrology and geology in China: A review

Cited by 4 publications

References 0 publications

Mid‐Mesozoicto Cenozoic multiphase deformation in the Bayanwula Tectonic Belt, northern China

Mid‐Mesozoicto Cenozoic multiphase deformation in the Bayanwula Tectonic Belt, northern China

Subduction zone processes and crustal growth mechanisms at Pacific Rim convergent margins: modern and ancient analogues

The Facies and Metamorphism Types Determination of Metamorphic Rock in The Part of Mekongga Complex

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