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学科主题: 地球科学::地质学
题名: Early Cretaceous wedge extrusion in the Indo-Burma Range accretionary complex: implications for the Mesozoic subduction of Neotethys in SE Asia
作者: Zhang, JE (Zhang, Ji'en)1; Xiao, WJ (Xiao, Wenjiao)1, 2, 3; Windley, B (Windley, Brian F.)4; Cai, FL (Cai, Fulong)5; Sein, K (Sein, Kyaing)6; Naing, S (Naing, Soe)6
通讯作者: Zhang, JE
关键词: MANIPUR OPHIOLITE COMPLEX ; MYANMAR OROGENIC BELT ; ZIRCON U-PB ; NORTHEAST INDIA ; NAGA HILLS ; TECTONIC EVOLUTION ; WESTERN MYANMAR ; EMPLACEMENT HISTORY ; PLATE STRATIGRAPHY ; SOUTHEAST-ASIA
刊名: INTERNATIONAL JOURNAL OF EARTH SCIENCES
发表日期: 2018
DOI: 10.1007/s00531-017-1468-7
卷: 106, 期:4, 页:1391-1408
收录类别: SCI
合作性质: 国际
文章类型: Article; Proceedings Paper
类目[WOS]: Geosciences, Multidisciplinary ; Geology
研究领域[WOS]: Geology
英文摘要: The Indo-Burma Range (IBR) of Myanmar, the eastern extension of the Yarlung-Tsangpo Neotethyan belt of Tibet in China, contains m,langes with serpentinite, greenschist facies basalt, chert, sericite schist, silty slate and unmetamorphosed Triassic sandstone, mudstone and siltstone interbedded with chert in the east, and farther north high-pressure blueschist and eclogite blocks in the Naga Hills m,lange. Our detailed mapping of the Mindat and Magwe sections in the middle IBR revealed a major similar to 18 km antiformal isocline in a m,lange in which greenschist facies rocks in the core decrease in grade eastwards and westwards symmetrically 'outwards' to lower grade sericite schist and silty slate, and at the margins to unmetamorphosed sediments, and these metamorphic rocks are structurally repeated in small-scale imbricated thrust stacks. In the Mindat section the lower western boundary of the isoclinal m,lange is a thrust on which the metamorphic rocks have been transported over unmetamorphosed sediments of the Triassic Pane Chaung Group, and the upper eastern boundary is a normal fault. These relations demonstrate that the IBR metamorphic rocks were exhumed by wedge extrusion in a subduction-generated accretionary complex. Along strike to the north in the Naga Hills is a comparable isoclinal m,lange in which central eclogite lenses are succeeded 'outwards' by layers of glaucophane schist and glaucophanite, and to lower grade greenschist facies sericite schist and slate towards the margins. In the Natchaung area (from west to east) unmetamorphosed Triassic sediments overlie quartzites, sericite schists, actinolite schists and meta-volcanic amphibolites derived from MORB-type basalt, which are in fault contact with peridotite. Olivine in the peridotite has undulatory extinction suggesting deformation at 600-700 A degrees C, similar to the peak temperature of the amphibolite; these relations suggest generation in a metamorphic sole. The amphibolites have U/Pb zircon ages of 119 +/- 3 Ma and 115 Ma, which are close to the zircon ages of nearby calc-alkaline granite and diorite, which belong to an active continental margin arc that extends along the western side of the Shan-Thai block. The IBR accretionary complex and the active continental margin arc were generated during Early Cretaceous (115-128 Ma) subduction of the Neotethys Ocean.
语种: 英语
WOS记录号: WOS:000401629200013
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/8230
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Geol & Geophys, Tethys Res Ctr, Beijing 100029, Peoples R China.
2.Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China.
3.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Peoples R China.
4.Univ Leicester, Dept Geol, Leicester LE1 7RH, Leics, England.
5.Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China.
6.Myanmar Geosci Soc, Yangon, Myanmar.

Recommended Citation:
Zhang, JE ,Xiao, WJ ,Windley, B ,et al. Early Cretaceous wedge extrusion in the Indo-Burma Range accretionary complex: implications for the Mesozoic subduction of Neotethys in SE Asia[J]. INTERNATIONAL JOURNAL OF EARTH SCIENCES,2018,106(4):1391-1408.
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