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Paleomagnetic results from late carboniferous to Early Permian rocks in the northern Qiangtang terrane, Tibet, China, and their tectonic implications

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Science China Earth Sciences 2017年第1期60卷 124-134页

作者： YANG XingFeng CHENG Xin ZHOU YaNan MA Lun ZHANG XiaoDong YAN ZhaoSheng PENG XiMing SU HaiLun WU HanNing Department of Geology and State Key Laboratory of Continental Dynamics Northwest University Xi 'an 710069 China

Results of a systematic paleomagnetic study are reported based on late carboniferous to Early Permian sedimentary rocks on the north slope of the Tanggula Mountains, in the northern Qiangtang terrane （NQT）, Tibet, China. Data revealed that magnetic minerals in limestone samples from the Zarigen Formation （CP^z）are primarily composed of magnetite, while those in sandstone samples from the Nuoribagaribao Formation （Pnr） are dominated by hematite alone, or hematite and magnetite in combination. Progressive thermal, or alternating field, demagnetization allowed us to isolate a stable high temperature component （HTC） in 127 specimens from 16 sites which successfully passed the conglomerate test, consistent with primary remnance. The tilt-corrected mean direction for late carboniferous to Early Permian rocks in the northern Qiangtang terrane is D°=30.2°, Is=-40.9°, ks=269.0, a95=2.3°, N=16, which yields a corresponding paleomagnetic pole at 25.7°N, 241.5°E （alp/rim=2.8°/1.7°）, and a paleolatitude of 23.4°S. Our results, together with previously reported paleomagnetic data, indicate that：（1） the NQT in Tibet, China, was located at a low latitude in the southern hemisphere, and may have belonged to the northern margin of Gondwana during the late carboniferous to Early Permian; （2） the Paleo-Tethys Ocean was large during the late carboniferous to Early Permian, and （3） the NQT subsequently moved rapidly northwards, perhaps related to the fact that the Paleo-Tethys Ocean was rapidly contracting from the late Permian to late Triassic while the Bangong Lake-Nujiang Ocean, the northern branch of the Neo-Tethys Ocean, expanded rapidly during this time.

关键词： Northem Qiangtang terrane late carboniferous Early Permian Rock magnetism Conglomerate test Paleomagnetic pole

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Paleoecology of late carboniferous Phylloid Algae in Southern Guizhou,SW China

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Acta Geologica Sinica(English Edition) 2007年第4期81卷 566-572页

作者： GONG Enpu ZHANG Yonglil GUAN Changqing Elias SAMANKASSOU SUN Baoliang Department of Geology Northeastern University Shenyang 110004 China Institute of Geology and Paleontology University of Fribourg Switzerland

Phylloid algae arc important rcef-builders in the late carboniferous. This paper focuses on the paleoecology of phylloid algae in the late carboniferous on well-exposed reefs in Ziyun County, Guizhou Province. Phylloid algae growing closely packed arc attached via holdfast or similar structure to substrate. They were growing in environments such as shallow water, photic zone and below the wave base with medium energy currents. They have a variety of morphological forms, such as single cup-shaped, cabbage-shaped and clustering cup-shaped. The thalli arc of certain tenacity and intensity. In the areas dominated by phylloid algae, other marine orgam＇sms arc relatively scarce. Obviously, phylloid algae arc stronger competitors for living space than other co-occurring organisms.

关键词： late carboniferous phylloid algae characteristics of paleoecology

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Provenance and tectonic setting of late carboniferous clastic rocks in West Junggar,Xinjiang,China:A case from the Hala-alat Mountains

Provenance and tectonic setting of Late Carboniferous clasti...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Huifei Tao Qingchen Wang Xiaofa Yang Lin Jiang State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Key Laboratory of Petroleum Resources Research Institute of Geology and GeophysicsChinese Academy of Sciences Graduate University of Chinese Academy of Sciences

The late carboniferous palaeo-tectonic setting of the West Junggar region is comprised of arcs alternating with *** analysis of the sedimentary rocks associated with these arc-related basins was conducted to better constrain the provenance and tectonic setting. Major and trace element geochemistry data of late carboniferous mudstones and sandstones in the Hala-alat Mountains suggest that these sedimentary rocks and their source areas are characterized by the following four features:(1) sediments experienced a simple recycling process;(2) a low degree weathering conditions in the source areas;(3) compositional immature of the sedimentary rocks;(4) dominated by intermediate to felsic provenance,with a few intermediate to mafic *** with the palaeo-flow data and previous authors’ works,a fore-arc basin model is proposed for the tectonic setting of the sedimentary *** Sawur arc is the primary provenance and supplies the major intermediate to felsic detrital *** Bozchekul-Chingiz arc and Kexia oceanic island arc are the other two secondary sources.

关键词： Geochemistry Sedimentary rocks Provenance Palaeo-flow Fore-arc basin late carboniferous West Junggar

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FIRST XENACANTHID FROM THE late carboniferous OF NORTHERN CAUCASUS, RUSSIA (POSTER)

FIRST XENACANTHID FROM THE LATE CARBONIFEROUS OF NORTHERN CA...

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第二届国际古生物学大会

作者： Alexander IVANOV Oliver HAMPE Department of Palaeontology St. Petersburg University 16 Liniya 29 St. Petersburg 199178 Russia Museum für Naturkunde der Humboldt-Universitat zu Berlin Invalidenstrasse 43 D-10115 Berlin Germany

The Palaeozoic chondrichthyans are poorly known from the Caucasus. They are documented so far from the late Devonian - carboniferous of North Caucasus, Russia (Ivanov, 2003) and of Transcaucasus, Azerbaijan (Lebedev, ... 详细信息

关键词： Xenacanthiformes late carboniferous Caucasus

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