Emplacement age and tectonic implications of the brecciated limestone at the edge of the Longmenshan klippe

doi:10.1007/s11430-015-5209-0

IVPP-IR > 中科院古脊椎所（2000年以后）

	Emplacement age and tectonic implications of the brecciated limestone at the edge of the Longmenshan klippe
	Xue ZhenHua 1,3; Shang QingHua 2; Jiang WenYing 1; Wang QingChen 1; Li ShuangJian 4
	2016-03-01
发表期刊	SCIENCE CHINA-EARTH SCIENCES
卷号	59 期号:3 页码:590-600
文章类型	Article
摘要	The Longmenshan thrust belt (LMTB) is one of the best natural laboratories for thin-skinned tectonics and has developed a series of NE-SW trending fold-and-thrust structures represented by a series of nappes and klippes, exemplified by the Tangbazi and Bailuding klippe. However, the timing and emplacement mechanism of these klippes are still in dispute. Three possible mechanisms have been proposed: (1) a Mesozoic-Cenozoic southeastward thrusting, (2) a Cenozoic gravity gliding, and (3) glacial deposition. Almost all of these klippes are tectonic and overlaid on folded Late Triassic sandstone except the Tangbazi klippe, which is located in the center of the LMTB and has a narrow tail extending southeastward and covering Jurassic-Quaternary rocks. This geometric relationship is considered the most important stratigraphic evidence to support the post-Cenozoic emplacement of the Longmenshan klippe. Our structural and petrological observations show that the rocks at the front of the Tangbazi and Bailuding structures are brecciated limestone, which is assumed to have been generated by a gravitational collapse and is not characteristic of the massive Permian strata. Artemisia pollen, which has been exclusively recognized in post-Late Eocene strata in Central Asia, was found in the matrix of this brecciated limestone. Therefore, our discovery indicates that the brecciated limestone was deposited after the Late Eocene rather than during the Permian as annotated on the geological map. In contrast, unbrecciated, massive Permian limestone overlaid on the folded Late Triassic rocks. Hence, the anomalous relationship of Permian strata overlaying Late Triassic rocks cannot be evidence of Cenozoic emplacement. According to currently recognized bulk strata relationships, we can only be sure that the klippe was emplaced in the post Late Triassic. The petrological characteristics of the brecciated limestone show that it was crumbled before the re-sedimentation of the breccia, implying that the LMTB might have experienced a rapid uplift during the Late Eocene.
关键词	Longmenshan Thrust Belt Klippe Artemisia Brecciated Limestone Thin-skinned Structure
WOS标题词	Science & Technology ; Physical Sciences
DOI	10.1007/s11430-015-5209-0
关键词[WOS]	TIBETAN PLATEAU ; GEOCHRONOLOGICAL CONSTRAINTS ; EASTERN MARGIN ; OROGENIC BELT ; SOUTH CHINA ; THRUST BELT ; SHAN ; DEFORMATION
收录类别	SCI
语种	英语
项目资助者	National Natural Science Foundation of China(41372028 ; Project of Major State Special Research on Petroleum(2011ZX05008-001) ; 41225009 ; 41472193)
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000371416000016
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/7120
专题	中科院古脊椎所（2000年以后）
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.China Petr & Chem Corp, Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Xue ZhenHua,Shang QingHua,Jiang WenYing,et al. Emplacement age and tectonic implications of the brecciated limestone at the edge of the Longmenshan klippe[J]. SCIENCE CHINA-EARTH SCIENCES,2016,59(3):590-600.
APA	Xue ZhenHua,Shang QingHua,Jiang WenYing,Wang QingChen,&Li ShuangJian.(2016).Emplacement age and tectonic implications of the brecciated limestone at the edge of the Longmenshan klippe.SCIENCE CHINA-EARTH SCIENCES,59(3),590-600.
MLA	Xue ZhenHua,et al."Emplacement age and tectonic implications of the brecciated limestone at the edge of the Longmenshan klippe".SCIENCE CHINA-EARTH SCIENCES 59.3(2016):590-600.

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