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Syn- and post-tectonic cooling and exhumation in the Larsemann hills, East Antarctica
Zhao, Y; Liu, XH; Wang SC(王世成); Wang, SC; Song, B
1997
发表期刊EPISODES
卷号20期号:2页码:#REF!
通讯作者Zhao, Y (reprint author), CHINESE ACAD GEOL SCI,INST GEOL,BAIWANZHUANG RD,BEIJING 100037,PEOPLES R CHINA.
文章类型Article
摘要In this paper, we present Ar-40/Ar-39 hornblende, biotite, and K-feldspar and apatite fission track thermochronological data to constrain the cooling and exhumation of high-grade rocks of the Larsemann Hills, Antarctica, sychronous with and postdated regional intense orogenesis of the early Paleozoic. Combined with Pb-Pb, U-Pb, Sm-Nd and Ar-40/Ar-39 age data published, a Ar-40-Ar-39 plateau age of hornblende recorded cooling below c. 520 degrees C at 514 +/- 2 Ma at a rate of c. 40 degrees C/Ma. This rapid cooling can be attributed to the tectonically driven exhumation along the ductile shear zoons. By 514 Ma, c.10-15 km of exhumation kan achieved. Slowing of the cooling rate front c. 9 degrees C/Ma to c. 3 degrees C/Ma occurred during 500-490 Ma, when the geotherm dropped through the closure temperature for Ar-40/Ar-39 system iii biotite at c. 300 degrees C. Documented by an Ar-40/Ar-39 plateau age of K-feldspar. further drop of the geotherm below c. 160 degrees C took place around 455 Ma, by which erosionally controlled exhumation han become dominant, as suggested by the very slow cooling rate at c. 3-0. 3 degrees C/Ma. The final cooling through apatite partial annealing zone happened at c. 210 Ma and could correspond to an early per ion of aborted rifting in the Lambert Garben region.
学科领域Geology
收录类别SCI
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:A1997YK35900010
引用统计
被引频次:24[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/226309
专题多学科研究中心
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GB/T 7714
Zhao, Y,Liu, XH,Wang SC,et al. Syn- and post-tectonic cooling and exhumation in the Larsemann hills, East Antarctica[J]. EPISODES,1997,20(2):#REF!.
APA Zhao, Y,Liu, XH,王世成,Wang, SC,&Song, B.(1997).Syn- and post-tectonic cooling and exhumation in the Larsemann hills, East Antarctica.EPISODES,20(2),#REF!.
MLA Zhao, Y,et al."Syn- and post-tectonic cooling and exhumation in the Larsemann hills, East Antarctica".EPISODES 20.2(1997):#REF!.
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