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Provenance of the Early-Middle Devonian Shugouzi Formation in the quruqtagh,Northeastern Xinjiang:Constraints from Sandstone Geochemistry and Heavy Mineral Analysis

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Acta Geologica Sinica(English Edition) 2022年第1期96卷 193-207页

作者： ZHANG Yingli WANG Zongqi WANG Tao MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China

The Early-Middle Devonian Shugouzi Formation in the quruqtagh block consists mainly of clastic rocks.However,their provenance has been scarcely studied since it was named.Geochemistry of clastic rocks was commonly used to interpret the provenance.Detrital heavy mineral analyses help frame the U-Pb age from zircon grains,integrated with geochemical data from detrital tourmaline and spinels.These techniques were used to characterize components of the sediment flux and define erosion areas in the Qurugtagh block,further providing evidence about the tectonic evolution of the South Tianshan and Tarim plate.The maximum depositional age constrained by detrital zircon dating was Early-Middle Devonian.Multiple diagrams for sedimentary provenance using major and trace elements indicate that continental island arc-related felsic rocks were the major source rocks for the Shugouzi Formation.Detrital tourmalines are dravite and schorl.The results of detrital tourmaline electron probe microanalysis(EPMA)show that the source rocks are mainly metasedimentary rocks and granitoids.The detrital chromian spinels within the sediments are characterized by high chroumium(Cr^(#))and varying magnesium(Mg^(#)).The discrimination plots reveal that these spinels were sourced from island arc magmatic rocks.The laser ablation inductively-coupled plasma mass spectrometry(LA-ICP-MS)U-Pb chronology of detrital zircons suggests that the sediments were derived mainly from 414-491 Ma and 744-996 Ma magmatic rocks.Paleocurrent restoration,sandstone geochemistry,EPMA,and detrital zircon geochronology indicate that the source rocks were predominantly derived from Late Ordovician and Devonian magmatic rocks and subordinately from recycled Neoproterozoic magmatic rocks.Comprehensive analyses of the source areas suggest that a remnant arc still existed in the Early Devonian and the Shugouzi Formation was deposited in a passive continental margin.

关键词： Shugouzi Formation provenance analysis tectonic setting passive continental margin quruqtagh

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Neoproterozoic Volcanic Rocks in the Southern quruqtagh of Northwest China:Geochemistry,Zircon Geochronology and Tectonic Implications

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Acta Geologica Sinica(English Edition) 2013年第1期87卷 118-130页

作者： ZHANG Yingli WANG Zongqi YAN Zhen WANG Tao Institute of Mineral Resources Chinese Academy of Geological Sciences Institute of Geology Chinese Academy of Geological Sciences

The Early Neoproterozoic Beiyixi Formation volcanic rocks of the southern quruqtagh comprise mainly of a suite of tholeiitic basalts, alkaline andesites, and calc-alkaline rhyolites. The rhyolites are characterized by variably fractionated enrichment in light rare earth elements （LREE） and fiat in heavy rare earth elements （HREE）, and strongly negative Eu anomalies. Compared to the rhyolites, the andesites also exhibit enrichment in LREE and flat HREE （chondrite-normalized values of La/Yb,and La/Sm are 13.30-41.09, 3.18-6.89 respectively）. Their rare earth element patterns display minor negative Eu anomalies. Both of them exhibit coherent patterns with strongly to moderately negative anomalies of Nb, Zr, Ti, and Hf on spider diagrams. Two rhyolite and one andesite magmatic zircons with defined oscillatory zoning yielded weighted mean 206pb/23Su ages of 743 ± 7 Ma, 741±2 Ma, and 7274 Ma. These ages are interpreted to represent the timing of volcanic eruptions. According to geochemistry and rock type, these volcanic rocks formed within a continental island-arc environment following subduction of the oceanic crust during the Early Neoproterozoic period.

关键词： quruqtagh Beiyixi Formation volcanic rocks geochemistry zircon geochronology,tectonic setting

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Vermicular fossils in the Early Cambrian Xidashan Formation in the quruqtagh region of Xinjiang, China

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Progress in Natural Science:Materials International 2006年第5期16卷 559-562页

作者： YANG Ruidong, ZHANG Chuanlin, SONG Guoqi and LUO Xinrong (Postgraduate School of Guizhou University, Guiyang 550025, China Nanjing Institute of Geology and Mineral Resources, Nanjing 210016, China Geological Survey of No. 3 Geological Party, Xinjiang, Kurle 841000, China) Postgraduate School of Guizhou University Guiyang 550025 China Nanjing Institute of Geology and Mineral Resources Nanjing 210016 China Geological Survey of No. 3 Geological Party Xinjiang Kurle 841000 China

Large amounts of vermicular fossils and a minor amount of sponge animal fossils have been found in the Early Cambrian Xidashan Formation in the region of quruqtagh, Xinjiang. Vermicular fossils are generally more than 50 mm long and 0. 3-1. 4 mm wide; their wrinkled lamellae are microfine with 3-10 pieces within the length of every each millimeter. The fossils are considered to be Sabellidites cambriensis Sokolov (1965) . The Xidashan Formation is the highest stratum in which Sabellidites occur, as has been so far reported.

关键词： vermicular fossil Early Cambrian quruqtagh Xinjiang.

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Detrital zircon U–Pb geochronology and Hf isotopic compositions of Middle–Upper Ordovician sandstones from the quruqtagh area, eastern Tarim Basin:implications for sedimentary provenance and tectonic evolution

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Chinese Science Bulletin 2014年第10期59卷 1002-1012页

作者： Shunli Dong Zhong Li Jianqiang Xu Jian Gao Chuntao Guo Institute of Geology and Geophysics Chinese Academy of Sciences University of Chinese Academy of Science

Figuring out whether the sedimentary provenance regions of the thick deep-water turbidite systems deposited during Middle–Upper Ordovician in South quruqtagh are the intracontinental uplifts or the peripheral orogenic belts is of great significance for us to understand the tectono-sedimentary nature of the northeastern Tarim Basin and basin-range coupling processes in the middle Paleozoic.This paper reports the in situ LA-ICP-MS U–Pb ages and Hf isotope data on detrital zircons from two Middle–Upper Ordovician sandstone samples which were collected from the Charchag Formation and the Zatupo Formation in South quruqtagh,respectively.The results show that the studied two samples have extremely similar U–Pb age patterns and Hf isotopic compositions,reflecting multiphase tectonothermal events with age groups of 527–694,713–870 Ma(peaking at 760 Ma),904–1,090,1,787–2,094 Ma(peaking at 1,975 Ma)and 2,419–2,517 Ma.Combining previous studies,the presence of age groups of 713–1,090 and1,787–2,094 Ma,respectively,demonstrates that Tarim had ever been a part of Rodinia and Columbia supercontinent.Moreover,98%of 713–870 Ma detrital zircons are characterized by negative e Hf(t)values ranging from-38.07 to-0.61,which are highly consistent with those of Neoproterozoic granites from the quruqtagh area.No Early Paleozoic ages(*470–500 Ma)signifying subduction or collision events in Altyn Tagh were detected in the two samples,indicating that the Middle–Late Ordovician sediments in South quruqtagh and northern Mangar depression were mainly derived from intracontinental uplifts,i.e.,the North quruqtagh uplift or the Tabei paleo-uplift,rather than the Altyn Tagh.In conjunction with regional sedimentary-tectonic background and previous studies,we proposed preliminarily that the northeastern Tarim remained as a passive continental margin in Late Ordovician and changed into an active-continental margin in Silurian due to the southward subduction of the South-Tianshan Ocean.

关键词： Tarim Basin - quruqtagh Middle-Upper Ordovician Detrital zircons Provenance Altyn Tagh

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Detrital zircon U-Pb geochronology and Hf isotopic compositions of Middle-Upper Ordovician sandstones from the quruqtagh area,eastern Tarim Basin:implications for sedimentary provenance and tectonic evolution

Detrital zircon U-Pb geochronology and Hf isotopic compositi...

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中国科学院地质与地球物理研究所2014年度（第14届）...

作者： Shunli Dong Zhong Li Jianqiang Xu Jian Gao Chuntao Guo Institute of Geology and Geophysics Chinese Academy of Sciences University of Chinese Academy of Science

Figuring out whether the sedimentary provenance regions of the thick deep-water turbidite systems deposited during Middle-Upper Ordovician in South quruqtagh are the intracontinental uplifts or the peripheral orogenic belts is of great significance for us to understand the tectono-sedimentary nature of the northeastern Tarim Basin and basin-range coupling processes in the middle Paleozoic.This paper reports the in situ LA-ICP-MS U-Pb ages and Hf isotope data on detrital zircons from two Middle-Upper Ordovician sandstone samples which were collected from the Charchag Formation and the Zatupo Formation in South quruqtagh,respectively.The results show that the studied two samples have extremely similar U-Pb age patterns and Hf isotopic compositions,reflecting multiphase tectonothermal events with age groups of 527-694,713-870 Ma(peaking at 760 Ma),904-1,090,1,787-2,094 Ma(peaking at 1,975 Ma)and 2,419-2,517 Ma.Combining previous studies,the presence of age groups of 713-1,090 and1,787-2,094 Ma,respectively,demonstrates that Tarim had ever been a part of Rodinia and Columbia supercontinent.Moreover,98%of 713-870 Ma detrital zircons are characterized by negativeε(t)values ranging from—38.07 to—0.61,which are highly consistent with those of Neoproterozoic granites from the quruqtagh area.No Early Paleozoicages(70-500 Ma)signifying subduction or collision events in Altyn Tagh were detected in the two samples,indicating that the Middle-Late Ordovician sediments in South quruqtagh and northern Mangar depression were mainly derived from intracontinental uplifts,i.e.,the North quruqtagh uplift or the Tabei paleo-uplift,rather than the Altyn Tagh.In conjunction with regional sedimentary-tectonic background and previous studies,we proposed preliminarily that the northeastern Tarim remained as a passive continental margin in Late Ordovician and changed into an active-continental margin in Silurian due to the southward subduction of the South-Tianshan Ocean.

关键词： Tarim Basin quruqtagh MiddleUpper Ordovician Detrital zircons Provenance Altyn Tagh

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