Late Paleoproterozoic to early Mesoproterozoic Dongchuan Group in Yunnan, SW China: Implications for tectonic evolution of the Yangtze Block

Zhao, Xin-Fu; Zhou, MF; Li, Jian Wei; Sun, Min; Gao, Junfeng; Sun, Wei; Yang, Jin‐Hui

doi:10.1016/j.precamres.2010.06.021

Cited by 347 publications

(180 citation statements)

References 38 publications

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“…1,850-1,920 Ma, 2,250-2,350 Ma, and 2,650-2,750 Ma. The age results are consistent with those obtained from the strata of the Yinmin Formation (Zhao et al 2010). When combined, the detrital zircons have three age peaks at~1,850 Ma,~2,300, and 2,700 Ma (Fig.…”

Section: Zircon U-pb Agessupporting

confidence: 87%

“…The Yinmin Fm is mainly composed of hematite-bearing purplish-red siltstone and sandstone, with basal conglomerate in places (ESM 1 and 2a-b) (Wu et al 1990). These rocks are thought to be the oldest continental red-bed units in the Yangtze Block (Hua 1990b;Wu et al 1990;Zhao et al 2010). The uppermost part of the Yinmin Fm consists of intercalated siltstone and dolostone that are transitional to the thick-layered basal dolostone of the Luoxue Fm.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Zircons from a tuff unit of the Yinmin Fm have a LA-ICPMS U-Pb age of 1,742±13 Ma (Zhao et al 2010). Detrital zircons from the Yinmin Fm have U-Pb ages of~3.5 to~1.78 Ga (Zhao et al 2010).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Recent studies have shown that the Yangtze Block was likely a component of the Columbia supercontinent (Zhang et al 2006;Sun et al 2008;Zhao et al 2010). The Dongchuan Group has been suggested to have formed in an intracontinental rift basin likely during the initial breakup/fragmentation of the Columbia supercontinent (Zhao et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…The Dongchuan Group has been suggested to have formed in an intracontinental rift basin likely during the initial breakup/fragmentation of the Columbia supercontinent (Zhao et al 2010). In this paper, we present sulfide Re-Os dates of stratiform ores and a zircon U-Pb age of a dolerite intruding the stratiform orebody in order to constrain the timing of Cu mineralization.…”

Section: Introductionmentioning

confidence: 99%

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Late Paleoproterozoic sedimentary rock-hosted stratiform copper deposits in South China: their possible link to the supercontinent cycle

Zhao

Zhou

et al. 2012

Miner Deposita

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Giant sedimentary rock-hosted stratiform copper (SSC) deposits commonly occur in rift environments, temporally coincident with the breakup of the Rodinia and Pangea supercontinents. However, whether or not such deposits have also formed during the breakup of the Paleoproterozoic Columbia supercontinent is not well known. A group of dolostone-hosted Cu deposits in late Paleoproterozoic rift-related sedimentary sequences of the Dongchuan Group, South China, form one of the largest SSC districts in the world. Being one of the largest SSC deposits in the region, the Yinmin deposit has stratiform Cu orebodies intruded by dolerite dykes. One dyke has a SIMS zircon U-Pb age of 1,701±28 Ma, slightly younger than the orehosting strata with a zircon U-Pb age of 1,742±13 Ma for a tuff unit. Six chalcopyrite and bornite separates from stratiform orebodies contain highly radiogenic Os and extremely low common Os and yield a weighted mean Re-Os model age of 1,666±82 Ma and a 187 Os-187 Re errorchron age of 1,585±100 Ma. The present zircon U-Pb and sulfide Re-Os ages thus constrain the timing of the mineralization at 1,700 Ma. The Yinmin deposit and, by inference, other SSC deposits in the region, arguably represent a large-scale SSC mineralization event during the late Paleoproterozoic. The formation of these deposits was coeval with the initial breakup/fragmentation of the Columbia supercontinent. This study highlights the temporal and likely genetic links between large-sized SSC deposits and the supercontinent cycle.

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Section: Zircon U-pb Agessupporting

confidence: 87%

Section: Geological Backgroundmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Late Paleoproterozoic sedimentary rock-hosted stratiform copper deposits in South China: their possible link to the supercontinent cycle

Zhao

Zhou

et al. 2012

Miner Deposita

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Temporal and spatial patterns of sediment routing across the southeast margin of the Tibetan Plateau: Insights from detrital zircon

et al. 2016

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The Cenozoic deposits of the Tibetan Plateau's southeastern margin are often cited as part of a continental‐scale river system connecting the Paleo‐Yangtze River with the Paleo‐Red River. Confirming the purported connection and any subsequent drainage reorganization has garnered significant attention and varied proposed ages for reorganization. This study presents detrital zircon U‐Pb ages and paleocurrents in Eocene to Pleistocene sedimentary basin deposits distributed over a broad area of the southeast Tibetan Plateau margin within the area of proposed paleoriver connectivity. When combined with previously published studies, our U‐Pb ages allow examination of the temporal and spatial distributions of provenance throughout the Cenozoic. We identify six key age components of the detrital U‐Pb age distributions and use these to examine the patterns of sediment provenance for different Cenozoic epochs. Detailed analysis of these components shows that provenance for both onshore and offshore deposits is best described by local bedrock sources and provides little to no evidence of regional changes in provenance. This suggests that a stable fluvial system similar to the modern drainage network has existed since the Eocene with no evidence for major provenance‐altering river capture. Paleoflow measurements taken throughout the SE margin further corroborate the results of detrital zircon provenance. The combination of U‐Pb age components and paleocurrent directions does not support a Cenozoic connection between the Paleo‐Yangtze and Paleo‐Red Rivers.

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Chronochemostratigraphy of Platform Sequences Across the Paleoproterozoic‐Mesoproterozoic Transition

Chemale

Guadagnin

2018

Chemostratigraphy Across Major Chronological Boundaries

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Late Paleoproterozoic to early Mesoproterozoic Dongchuan Group in Yunnan, SW China: Implications for tectonic evolution of the Yangtze Block

Cited by 347 publications

References 38 publications

Late Paleoproterozoic sedimentary rock-hosted stratiform copper deposits in South China: their possible link to the supercontinent cycle

Late Paleoproterozoic sedimentary rock-hosted stratiform copper deposits in South China: their possible link to the supercontinent cycle

Temporal and spatial patterns of sediment routing across the southeast margin of the Tibetan Plateau: Insights from detrital zircon

Chronochemostratigraphy of Platform Sequences Across the Paleoproterozoic‐Mesoproterozoic Transition

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