Tectonic evolution of the Qiangtang Block, northern Tibet during the Late Cisuralian (Late Early Permian): Evidence from fusuline fossil records
Tectonic evolution of the Qiangtang Block, northern Tibet during the Late Cisuralian (Late Early Permian): Evidence from fusuline fossil records
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藏北羌塘地块晚西苏拉世（早二叠世晚期）构造演化：来自梭状化石记录的证据
DOI：
10.1016/j.palaeo.2012.06.025
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发表时间：
2012-09
期刊：
影响因子：
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通讯作者：
Zhang, Y.C., Shen, S.Z., Shi, G.R., Wang, Y.
中科院分区：
文献类型：
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作者：
Zhang, Y.C., Shen, S.Z., Shi, G.R., Wang, Y.
本文报道了羌塘地块二叠系（曲地组和泸沽组）地层和泥质岩化石的新发现，并讨论了该地块在晚晚西乌拉世（晚早二叠世）的古地理位置和构造历史。曲地组以厚浊积岩沉积为特征，含伪镰藻和Chalaroschwagerina等阿丁斯基型镰藻。fusulines以碎屑流沉积的颗粒形式沉积，表明其与浊积岩的沉积时间具有同步性。其后的泸沽组以海山型碳酸盐岩为主，基底不规则玄武岩。碳酸盐岩底部的Fusulines Cancellina、pseudodololina和Parafusulina证实其年龄为中昆日纪。从浊积体曲地组到海山陆古组的过渡被解释为连续的沉积过程，记录了羌塘地块与印度板块的分离。这种分离标志着新特提斯洋在羌塘地块和印度板块之间的打开。在古地理上，羌塘地块的分离与东部的宝山地块和西部的中帕米尔地块的分离具有可比性。相比之下，印度-巴基斯坦和阿曼北部分离导致的新特提斯洋的最终打开显然要比羌塘地块记录的这一事件晚得多。因此，新特提斯洋在整个冈瓦南北部边缘的打开被解释为一个历时性的系列事件。
The tectonic evolution of the Qiangtang Block in the Qinghai–Tibetan Plateau has been a controversial subject for a long time. In this paper, the discovery of new stratigraphic and fusuline fossil evidence from the Permian sequences (Qudi and Lugu formations) of the Qiangtang Block is reported and the palaeogeographical position and tectonic history of this block during the Late Cisuralian (Late Early Permian) are discussed. The Qudi Formation is typified by thick turbidite deposits and contains Artinskian fusulines such as Pseudofusulina and Chalaroschwagerina. The fusulines were deposited as grains involved in debris flow deposits, suggesting a synchronicity with the depositional time of the turbidites. The subsequent Lugu Formation is dominated by seamount-type carbonates with an irregular basalt base. Fusulines Cancellina, Pseudodoliolina and Parafusulina in the base of the carbonates confirm its age as middle Kungurian. The transition from the turbidite Qudi Formation to the seamount Lugu Formation is here interpreted to be a continuous depositional process recording the Qiangtang Block's separation from the Indian Plate. This separation signaled the opening of the Neotethys Ocean between the Qiangtang Block and the Indian Plate. Palaeogeographically, the Qiangtang Block's separation is comparable with the Baoshan Block's separation in the east and Central Pamir's separation in the west. By contrast, the ultimate opening of the Neotethys Ocean by the separation of India–Pakistan and northern Oman is apparently much later than this event recorded in the Qiangtang Block. Consequently, it is interpreted that the opening of the Neotethys Ocean in the whole northern Gondwanan margin is a diachronous series of events.
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作者：
Melle M Colani
通讯作者：
Melle M Colani
DOI：
10.1111/j.1755-6724.2011.00407.x
发表时间：
2011-04
期刊：
Acta Geologica Sinica ‐ English Edition
影响因子：
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作者：
Yue Wang;Jing Wang;Jun Chen;Weijie Wang;S. Shen;C. Henderson
通讯作者：
Yue Wang;Jing Wang;Jun Chen;Weijie Wang;S. Shen;C. Henderson
影响因子：
5.7
作者：
Y. Wanming;Guo Zhongping
通讯作者：
Y. Wanming;Guo Zhongping
影响因子：
2.2
作者：
S. Shen;Changqun Cao;G. Shi;Xiangdong Wang;Shilong Mei
通讯作者：
S. Shen;Changqun Cao;G. Shi;Xiangdong Wang;Shilong Mei
藏北羌塘中部镁铁质岩脉群锆石SHRIMP U-Pb定年及Hf同位素分析
DOI：
10.1007/s11434-009-0203-6
发表时间：
2009-03
期刊：
科学通报(英文版)
影响因子：
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作者：
Wang Yong;Li Cai;Ji ZhanSheng;Zhai QingGuo;Wang Jun
通讯作者：
Wang Jun