Origin and Emplacement of the Cambrian Yanglong Ophiolite in the North Qilian Suture
Fragments of Proto‐Tethyan oceanic lithosphere are well‐preserved along the southern belt of the North Qilian suture, and the origin and emplacement of these ophiolites have become subjects of intense debate. In this study, we integrate field observations, mineralogical and geochemical analyses, zir...
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Published in | Acta geologica Sinica (Beijing) Vol. 99; no. 2; pp. 409 - 424 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
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01.04.2025
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Abstract | Fragments of Proto‐Tethyan oceanic lithosphere are well‐preserved along the southern belt of the North Qilian suture, and the origin and emplacement of these ophiolites have become subjects of intense debate. In this study, we integrate field observations, mineralogical and geochemical analyses, zircon U‐Pb dating, and isotopic data to investigate the Yanglong ophiolite. The Yanglong ophiolitic rocks are found as tectonic slices resting on the Neoproterozoic sedimentary and volcanic rocks. These rocks are composed of Cambrian serpentinized peridotite, gabbro, dolerite, and rodingite. The spinels in the serpentinized peridotites have variable Cr# values (21, 38–46, and 59–61) and display affinity to those in abyssal and forearc peridotites. The dolerites show slight enrichment in Th and have elevated (La/Sm)N ratios (1.19–2.01), indicating a subduction‐related geochemical affinity. The Yanglong ophiolitic rocks have positive zircon εHf(t) values (+10.3 to +18.4) and whole‐rock εNd(t) values (+5.3 to +6.7) indicating derivation from partial melting of a depleted mantle source. These results, together with the regional geology, collectively suggest that the Yanglong ophiolite was generated in a forearc setting during the Early Cambrian northward intra‐oceanic subduction. It was emplaced onto the Central Qilian Block during the subsequent arc–continent collision, no later than the Early Ordovician. |
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AbstractList | Fragments of Proto‐Tethyan oceanic lithosphere are well‐preserved along the southern belt of the North Qilian suture, and the origin and emplacement of these ophiolites have become subjects of intense debate. In this study, we integrate field observations, mineralogical and geochemical analyses, zircon U‐Pb dating, and isotopic data to investigate the Yanglong ophiolite. The Yanglong ophiolitic rocks are found as tectonic slices resting on the Neoproterozoic sedimentary and volcanic rocks. These rocks are composed of Cambrian serpentinized peridotite, gabbro, dolerite, and rodingite. The spinels in the serpentinized peridotites have variable Cr# values (21, 38–46, and 59–61) and display affinity to those in abyssal and forearc peridotites. The dolerites show slight enrichment in Th and have elevated (La/Sm)N ratios (1.19–2.01), indicating a subduction‐related geochemical affinity. The Yanglong ophiolitic rocks have positive zircon εHf(t) values (+10.3 to +18.4) and whole‐rock εNd(t) values (+5.3 to +6.7) indicating derivation from partial melting of a depleted mantle source. These results, together with the regional geology, collectively suggest that the Yanglong ophiolite was generated in a forearc setting during the Early Cambrian northward intra‐oceanic subduction. It was emplaced onto the Central Qilian Block during the subsequent arc–continent collision, no later than the Early Ordovician. Fragments of Proto‐Tethyan oceanic lithosphere are well‐preserved along the southern belt of the North Qilian suture, and the origin and emplacement of these ophiolites have become subjects of intense debate. In this study, we integrate field observations, mineralogical and geochemical analyses, zircon U‐Pb dating, and isotopic data to investigate the Yanglong ophiolite. The Yanglong ophiolitic rocks are found as tectonic slices resting on the Neoproterozoic sedimentary and volcanic rocks. These rocks are composed of Cambrian serpentinized peridotite, gabbro, dolerite, and rodingite. The spinels in the serpentinized peridotites have variable Cr # values (21, 38–46, and 59–61) and display affinity to those in abyssal and forearc peridotites. The dolerites show slight enrichment in Th and have elevated (La/Sm) N ratios (1.19–2.01), indicating a subduction‐related geochemical affinity. The Yanglong ophiolitic rocks have positive zircon ε Hf ( t ) values (+10.3 to +18.4) and whole‐rock ε Nd ( t ) values (+5.3 to +6.7) indicating derivation from partial melting of a depleted mantle source. These results, together with the regional geology, collectively suggest that the Yanglong ophiolite was generated in a forearc setting during the Early Cambrian northward intra‐oceanic subduction. It was emplaced onto the Central Qilian Block during the subsequent arc–continent collision, no later than the Early Ordovician. |
Author | PAN, Tong WANG, Bingzhang FU, Changlei XUE, Wanwen GUO, Xianqing XIAO, Wenjiao YAN, Zhen AITCHISON, Jonathan C. LI, Wufu |
Author_xml | – sequence: 1 givenname: Changlei surname: FU fullname: FU, Changlei organization: Qinghai Geological Survey Institute – sequence: 2 givenname: Wanwen surname: XUE fullname: XUE, Wanwen email: 593339751@qq.com organization: Qinghai Geological Survey Institute – sequence: 3 givenname: Tong surname: PAN fullname: PAN, Tong email: pant66@163.com – sequence: 4 givenname: Zhen surname: YAN fullname: YAN, Zhen organization: Chinese Academy of Geological Sciences – sequence: 5 givenname: Xianqing surname: GUO fullname: GUO, Xianqing organization: Chinese Academy of Geological Sciences – sequence: 6 givenname: Jonathan C. surname: AITCHISON fullname: AITCHISON, Jonathan C. organization: University of Queensland – sequence: 7 givenname: Wenjiao surname: XIAO fullname: XIAO, Wenjiao organization: Chinese Academy of Sciences – sequence: 8 givenname: Bingzhang surname: WANG fullname: WANG, Bingzhang – sequence: 9 givenname: Wufu surname: LI fullname: LI, Wufu organization: Qinghai Geological Survey Institute |
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Notes | pant66@163.com PAN Tong, male, born in 1966 in Haidong, Qinghai Province; Ph.D., graduated from Jilin University; professor of engineering at the Bureau of Geological Exploration and Development of Qinghai Province. He is engaged in metallogenic regularity and mineral exploration. E‐mail FU Changlei, male, born in 1988 in Linyi, Shandong Province; Ph.D., associate professor of the Institute of Geology, Chinese Academy of Geological Sciences. He is now working on geological mapping, ophiolite, and tectonics. E‐mail About the first author fucl815@126.com 593339751@qq.com XUE Wanwen, male, born in 1971 in Xining, Qinghai Province; master, graduated from China University of Geosciences (Beijing); professor of engineering at the No.3 Exploration Institute of Geology Resources of Qinghai Province. He is engaged in geological survey and mineral exploration. E‐mail About the corresponding authors . ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 |
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Snippet | Fragments of Proto‐Tethyan oceanic lithosphere are well‐preserved along the southern belt of the North Qilian suture, and the origin and emplacement of these... |
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SubjectTerms | Abyssal zone Affinity arc–continent collision Cambrian Earth mantle forearc ophiolite Gabbro Geochemistry Geology intra‐oceanic subduction Lithosphere Ophiolites Ordovician Peridotite Proto‐Tethys Ocean Qilian Orogen Radiometric dating Rocks Subduction Subduction (geology) Tectonics Volcanic rocks Zircon |
Title | Origin and Emplacement of the Cambrian Yanglong Ophiolite in the North Qilian Suture |
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