U-Pb zircon geochronology of Tianshan eclogites in NWChina: implication for the collision between the Yili and Tarim blocks of the southwestern Altaids

被引：304

作者：

Su, Wen ^{[1
]}

Gao, Jun ^{[1
]}

Klemd, Reiner ^{[2
]}

Li, Ji-Lei ^{[1
]}

Zhang, Xi ^{[1
]}

Li, Xian-Hua ^{[1
]}

Chen, Neng-Song ^{[3
]}

Zhang, Lu ^{[3
]}

机构：

[1] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China

[2] Univ Erlangen Nurnberg, GeoZentrum Nordbayern, D-91054 Erlangen, Germany

[3] China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China

来源：

EUROPEAN JOURNAL OF MINERALOGY | 2010年 / 22卷 / 04期

基金：

中国国家自然科学基金;

关键词：

eclogite; U-Pb zircon age; collision time; high-pressure metamorphism; Tianshan; ULTRAHIGH-PRESSURE METAMORPHISM; FLUID-ROCK INTERACTION; HP-LT ROCKS; WESTERN TIANSHAN; NW-CHINA; OROGENIC BELT; TECTONIC IMPLICATIONS; GEODYNAMIC EVOLUTION; NORTHWESTERN CHINA; TIEN-SHAN;

D O I：

10.1127/0935-1221/2010/0022-2040

中图分类号：

P57 [矿物学];

学科分类号：

070403 [天体物理学];

摘要：

Zircon grains separated from an eclogite boudin intercalated within blueschists in Tianshan (NW China) were investigated by Raman spectroscopy, cathodoluminescence imaging and secondary ion mass spectrometry (SIMS). These grains have a thin homogeneous rim and an oscillatory inner zone domain with or without a relict inherited core. Omphacite, phengite and rutile inclusions were identified within the rim domain of zircon grains only, indicating that the rim had formed during peak eclogite-facies metamorphism. U-Pb zircon data record three distinct age populations: 2450 +/- 31 to 1956 +/- 26 Ma (for the inherited core), 486 +/- 8 to 428 +/- 6 Ma (oscillatory inner zone) as well as 319.5 +/- 2.9 Ma and 318.7 +/- 3.3 Ma (for the metamorphic rim). These new ages suggest that the metamorphism associated with the collision of the Yili and the Tarim blocks along the southwestern margin of the Altaids must have occurred during the Late Carboniferous (ca., 320 Ma).

引用

页码：473 / 478

页数：6

共 34 条

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