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
刊名EPISODES
1997
卷号20期号:2页码:#REF!
学科分类Geology
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
英文摘要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.
类目[WOS]Geosciences, Multidisciplinary
收录类别SCI
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
专题中国科学院高能物理研究所_多学科研究中心_期刊论文
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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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