Tectonic development of the southern Chinese Altai Range as determined by structural geology, thermobarometry, 40Ar/39Ar thermochronology, and Th/Pb ion-microprobe monazite geochronology

被引：89

作者：

Briggs, Stephanie M. ^{[1
,4
]}

Yin, An ^{[1
,2
,3
]}

Manning, Craig E. ^{[1
]}

Chen, Zheng-Le ^{[3
]}

Wang, Xiao-Feng ^{[3
]}

机构：

[1] Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USA

[2] Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA

[3] China Univ Geosci, Struct Geol Grp, Sch Earth Sci & Resources, Beijing 100083, Peoples R China

[4] William Lettis & Associates, Augusta, GA 30901 USA

来源：

GEOLOGICAL SOCIETY OF AMERICA BULLETIN | 2009年 / 121卷 / 9-10期

基金：

美国国家科学基金会;

关键词：

METAMORPHIC CORE COMPLEX; NORTHWEST CHINA; CENTRAL-ASIA; CRUSTAL GROWTH; K-FELDSPAR; TIEN-SHAN; NW CHINA; MONGOLIA; CONSTRAINTS; EVOLUTION;

D O I：

10.1130/B26385.1

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The 2500-km Altai Range is located in the central part of the Central Asia Orogenic System, a tectonic collage comprising oceanic and continental fragments that were assembled during the Paleozoic continental growth of Eurasia. We conducted field mapping, 40Ar/39Ar thermochronology, metamorphic petrology, and Th/Pb ion-microprobe monazite dating in the southern Chinese Altai Range. This study demonstrates the presence of a south-vergent, Permo-Triassic thrust belt active across the region. Metamorphic conditions of 610 +/- 35 degrees C and 5.7 +/- 1.8 kbar were reached by schists with Permo-Triassic monazite ages. Mica 40Ar/39Ar ages range from Late Permian to Jurassic, and cooling in these rocks is correlated with thrust faulting. This shortening was synchronous with localized left-lateral, strike-slip shear deformation. Our work suggests that the high-grade schists of the Altai orogen were buried to depths of more than 18-20 km and were exhumed in the Permian to Jurassic. The Permo-Triassic Altai thrust belt was reactivated locally by Late Jurassic contraction after ca. 160 Ma, which may result from the final closure of the Mongol-Okhotsk Ocean or the collision of the Lhasa block onto the southern Asian margin.

引用

页码：1381 / 1393

页数：13

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