桂东早古生代地层碎屑锆石U-Pb同位素年代学及其对华夏陆块加里东期构造事件性质的约束

李青; 段瑞春; 凌文黎; 胡明安; 张军波; 杨振

Volume 34 Issue 1

Jan. 2009

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Article Navigation > Earth Science > 2009 > 34(1): 189-202

LI Qing, DUAN Rui-chun, LING Wen-li, HU Ming-an, ZHANG Jun-bo, YANG Zhen, 2009. Detrital Zircon U-Pb Geochronology of the Early Paleozoic Strata in Eastern Guangxi and Its Constraint on the Caledonian Tectonic Nature of the Cathaysian Continental Block. Earth Science, 34(1): 189-202.

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Detrital Zircon U-Pb Geochronology of the Early Paleozoic Strata in Eastern Guangxi and Its Constraint on the Caledonian Tectonic Nature of the Cathaysian Continental Block

LI Qing^{1, 2
,},
DUAN Rui-chun^{3, 4},
LING Wen-li^{3, 4},
HU Ming-an¹,
ZHANG Jun-bo^{3, 4},
YANG Zhen¹

1.
Faculty of Resources, China University of Geosciences, Wuhan 430074, China
2.
Guangxi Bureau of Geology, Mineral Prospecting and Exploitation, Nanning 530023, China
3.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
4.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2008-10-29
Publish Date: 2009-01-25

Abstract

Abstract

A comprehensive U-Pb geochronological study of detrital zircons from the Cambrian and Devonian strata in Dayaos-han-Damingshan area, eastern Guangxi has been conducted. The strata contact through an unconformity surface, indicating an early Paleozoic depositing hiatus in the region. The Cambrian detrital zircons are characterized by age spectrums of 2.7-2.6,-1.8, 1.4-1.1 and-1.0 Ga with minor Meso-to Neoarchean grains as well as hydrothermal event records of 250 and 105 Ma. The Devonian detrital zircons, only few of which were formed in Paleoarcheozoic age, were dominated by-1.7 and 1.0 Ga grains and recorded a pronounced thermal event at-100 Ma. The geochronology suggests that the study area possessed a Cathaysian attribute in continental accretion and tectonic evolution during the Pre-Devonian, and thus infers that the continental boundary between the Yangtze and Cathaysian blocks was located northwestern to the Dayaoshan-Damingshan terrain. Contrasting characters in geochronology of the Cambrian and Devonian strata indicate a shift in sedimentary provenance after the depositing hiatus. However, zircons with timing intervening the Cambrian and Devonian are absent, which suggests that Cale donian magmatism was minimal or lacking in the region and its proximity. Combined with previous studies, it is inferred that Caledonian folding was likely resulted from an oblique collision between the Cathaysia and a continental block which had moved apart later. This collision also resulted in a development of passive basin in Dayaoshan-Damingshan area by extruding along the vertical direction of pressing. Isotopic resetting and hydrothermal reaction are thought to account for the Mesozoic ages recog-nized in a number of detrital zircons. This observation suggests that large scale eonvecting hydrothermal fluids were involved in the Indosinian and Yanshanian magmatic and tectonic activities. Thus the convecting hydrothermal liquids are regarded as one of the key factors resulting in the mineralization of the late Mesozoic Au-polymetallic ore deposits in this region and plausibly along the whole southeastern margin of the South China fold belt.
- Dayaoshan area of Guangxi Province,
- Early Paleozoic,
- detrital zircon,
- U-Pb geochronology,
- Caledonian tectonic event.

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Detrital Zircon U-Pb Geochronology of the Early Paleozoic Strata in Eastern Guangxi and Its Constraint on the Caledonian Tectonic Nature of the Cathaysian Continental Block

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