Raman spectra of carbonaceous materials in a fault zone in the Longmenshan thrust belt, China; comparisons with those of sedimentary and metamorphic rocks

2017 ◽  
Vol 699 ◽  
pp. 129-145 ◽  
Author(s):  
Yui Kouketsu ◽  
Ichiko Shimizu ◽  
Yu Wang ◽  
Lu Yao ◽  
Shengli Ma ◽  
...  
Keyword(s):  
Fault Zone ◽  
Raman Spectra ◽  
Metamorphic Rocks ◽  
Thrust Belt ◽  
Carbonaceous Materials ◽  
Longmenshan Thrust Belt

scholarly journals An intracontinental orogen exhumed by basement-slice imbrication in the Longmenshan Thrust Belt of the Eastern Tibetan Plateau

2021 ◽  
Author(s):  
Zhenhua Xue ◽  
Wei Lin ◽  
Yang Chu ◽  
Michel Faure ◽  
Yan Chen ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Late Jurassic ◽  
Amphibolite Facies ◽  
Metamorphic Rocks ◽  
Thrust Belt ◽  
Normal Faulting ◽  
Weak Zone ◽  
Detailed Structural Analysis ◽  
Longmenshan Thrust Belt ◽  
Eastern Tibet

The Longmenshan Thrust Belt in Eastern Tibet resulted from a Mesozoic orogeny and Cenozoic reworking. It is generally believed that the Cenozoic tectonics along the Longmenshan Thrust Belt are mostly inherited from the Mesozoic. Reconstructing the Mesozoic tectonics of the Longmenshan Thrust Belt is therefore important for understanding its evolutionary history. On the basis of detailed structural analysis, we recognized a Main Central Boundary that divides the Longmenshan Thrust Belt into a Southeastern Zone and a Northwestern Zone. Both zones underwent a main D1 event characterized by D1E top-to-the-SE thrusting in the Southeastern Zone and D1W top-to-the-NW/N thrusting in the Northwestern Zone. In the Southeastern Zone, a D2 top-to-the-NW/N normal faulting that cuts the D1E structures is developed along the NW boundary of the basement complexes. Newly obtained and previous geochronological data indicate that the D1E and D1W events occurred synchronously at ca. 224−219 Ma, and the D2 top-to-the-NW/N normal faulting was episodically activated at ca. 166−160 Ma, 141−120 Ma, 81−47 Ma, and 27−25 Ma. Episodic and synchronously activated top-to-the-NW normal faulting and top-to-the-SE thrusting along the northwestern and southeastern boundaries of the basement complexes, respectively, leads us to propose that the basement slices were episodically imbricated to the SE during the Late Jurassic−Early Cretaceous and Late Cretaceous−earliest Paleocene. The D1 amphibolite facies metamorphic rocks above the basement complexes recorded fast exhumation during the Late Jurassic−Early Cretaceous. We propose that the early Mesozoic northwestward basement underthrusting along a crustal “weak zone” was responsible for the D1 double-vergent thrusting and amphibolite facies metamorphism. Subsequent basement-slice imbrications reworked the Longmenshan Thrust Belt and exhumed the amphibolite facies rocks. Our results highlight the importance of basement underthrusting and imbrication in the formation and reworking of the intracontinental Longmenshan Thrust Belt in Eastern Tibet.

scholarly journals Carbonaceous Materials in the Fault Zone of the Longmenshan Fault Belt: 1. Signatures within the Deep Wenchuan Earthquake Fault Zone and Their Implications

Minerals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 385 ◽  
Author(s):  
Li-Wei Kuo ◽  
Jyh-Rou Huang ◽  
Jiann-Neng Fang ◽  
Jialiang Si ◽  
Haibing Li ◽  
...  
Keyword(s):  
Wenchuan Earthquake ◽  
Fault Zone ◽  
Active Fault ◽  
Carbonaceous Materials ◽  
Coseismic Slip ◽  
Earthquake Fault ◽  
Active Fault Zone ◽  
2008 Wenchuan Earthquake ◽  
Seismic Slip ◽  
Longmenshan Fault

Graphitization of carbonaceous materials (CM) has been experimentally demonstrated as potential evidence of seismic slip within a fault gouge. The southern segment of the Longmenshan fault, a CM-rich-gouge fault, accommodated coseismic slip during the 2008 Mw 7.9 Wenchuan earthquake and potentially preserves a record of processes that occurred on the fault during the slip event. Here, we present a multi-technique characterization of CM within the active fault zone of the Longmenshan fault from the Wenchuan earthquake Fault Scientific Drilling-1. By contrast with field observations, graphite is pervasively and only distributed in the gouge zone, while heterogeneously crystallized CM are present in the surrounding breccia. The composite dataset that is presented, which includes the localized graphite layer along the 2008 Wenchuan earthquake principal slip zone, demonstrates that graphite is widely distributed within the active fault zone. The widespread occurrence of graphite, a seismic slip indicator, reveals that surface rupturing events commonly occur along the Longmenshan fault and are characteristic of this tectonically active region.

scholarly journals Supplemental Material: An intracontinental orogen exhumed by basement-slice imbrication in the Longmenshan Thrust Belt of the Eastern Tibetan Plateau

2021 ◽  
Author(s):  
Zhenhua Xue ◽  
Wei Lin ◽  
et al.
Keyword(s):  
Tibetan Plateau ◽  
Energy Dispersive ◽  
Thrust Belt ◽  
Eastern Tibetan Plateau ◽  
X Ray ◽  
Related Energy ◽  
Analytical Results ◽  
Longmenshan Thrust Belt ◽  
Step Heating

Three figures (Figs. S1–S3) and two tables (Tables S1–S2). Figure S1: Images and related Energy Dispersive X-ray spectra to show that quartz melts infilled in feldspar crack; Figure S2: Features of samples selected for 40Ar-39Ar dating; Figure S3: Inverse isochron lines that yield false initial 40Ar/39Ar ratio; Table S1: Detailed SIMS U-Pb zircon results of sample CX48; Table S2: Detailed 40Ar/39Ar VG3600 Furnace Step-Heating Analytical Results.

Sedimentary record of Late Triassic transpressional tectonics of the Longmenshan thrust belt, SW China

2012 ◽  
Vol 48 ◽  
pp. 43-55 ◽  
Author(s):  
Bin Deng ◽  
Shugen Liu ◽  
Luba Jansa ◽  
Junxing Cao ◽  
Yang Cheng ◽  
...  
Keyword(s):  
Late Triassic ◽  
Thrust Belt ◽  
Sedimentary Record ◽  
Sw China ◽  
Longmenshan Thrust Belt

Protolith ages and deformation mechanism of metamorphic rocks in the Zhangbaling uplift segment of the Tan-Lu Fault Zone

2014 ◽  
Vol 57 (11) ◽  
pp. 2740-2757 ◽  
Author(s):  
Tian Zhao ◽  
Guang Zhu ◽  
ShaoZe Lin ◽  
LeJia Yan ◽  
QinQin Jiang
Keyword(s):  
Fault Zone ◽  
Deformation Mechanism ◽  
Metamorphic Rocks

scholarly journals Supplemental Material: An intracontinental orogen exhumed by basement-slice imbrication in the Longmenshan Thrust Belt of the Eastern Tibetan Plateau

2021 ◽  
Author(s):  
Zhenhua Xue ◽  
Wei Lin ◽  
et al.
Keyword(s):  
Tibetan Plateau ◽  
Energy Dispersive ◽  
Thrust Belt ◽  
Eastern Tibetan Plateau ◽  
X Ray ◽  
Related Energy ◽  
Analytical Results ◽  
Longmenshan Thrust Belt ◽  
Step Heating

Three figures (Figs. S1–S3) and two tables (Tables S1–S2). Figure S1: Images and related Energy Dispersive X-ray spectra to show that quartz melts infilled in feldspar crack; Figure S2: Features of samples selected for 40Ar-39Ar dating; Figure S3: Inverse isochron lines that yield false initial 40Ar/39Ar ratio; Table S1: Detailed SIMS U-Pb zircon results of sample CX48; Table S2: Detailed 40Ar/39Ar VG3600 Furnace Step-Heating Analytical Results.

scholarly journals Supplemental Material: An intracontinental orogen exhumed by basement-slice imbrication in the Longmenshan Thrust Belt of the Eastern Tibetan Plateau

2021 ◽  
Author(s):  
Zhenhua Xue ◽  
Wei Lin ◽  
et al.
Keyword(s):  
Tibetan Plateau ◽  
Energy Dispersive ◽  
Thrust Belt ◽  
Eastern Tibetan Plateau ◽  
X Ray ◽  
Related Energy ◽  
Analytical Results ◽  
Longmenshan Thrust Belt ◽  
Step Heating

Three figures (Figs. S1–S3) and two tables (Tables S1–S2). Figure S1: Images and related Energy Dispersive X-ray spectra to show that quartz melts infilled in feldspar crack; Figure S2: Features of samples selected for 40Ar-39Ar dating; Figure S3: Inverse isochron lines that yield false initial 40Ar/39Ar ratio; Table S1: Detailed SIMS U-Pb zircon results of sample CX48; Table S2: Detailed 40Ar/39Ar VG3600 Furnace Step-Heating Analytical Results.

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