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The Open of the Paleo‐Tethys Ocean: Inferred from the Early Paleozoic Ophiolite in the Qiangtang Area, Northern Tibetan Plateau

The Open of the Paleo‐Tethys Ocean: Inferred from the Early Paleozoic Ophiolite in the Qiangtang... The Paleo-Tethys Ocean was a Paleozoic ocean yielded weighted mean ages of 437-501 Ma. The located between the Gondwana and Laurasia occurrence of the ophiolite suite suggests that a supercontinents. It was usually consider to opening in the Paleozoic Ocean basin (Paleo-Tethys) existed in middle early Paleozoic with the rifting of the Hun superterrane of the Qiangtang terrane. We hypothesize that the from Gondwana following the subduction of the Rheic ophiolite in the middle of the Qiangtang terrane Ocean/proto-Tethys Ocean. However, the opening time represents the western extension of the Sanjiang and detailed evolutionary history of the Paleo-Tethys Paleo-Tethys ophiolite in the east margin of the Tibetan Ocean are still unclear. The Paleozoic ophiolites have Plateau, and they mark the main Paleo-Tethys Ocean. recently been documented in the middle of the Qiangtang This is the oldest ophiolite from the Paleo-Tethyan suture terrane, northern Tibetan Plateau, and they mainly occur zones and the Paleo-Tethys Ocean basin probably in the Gangma Co area. These ophiolites are composed opened in the Middle Cambrian, and continued to grow of serpentinite, pyroxenite, isotropic and cumulate throughout the Paleozoic. The ocean was finally closed gabbros, basalt, hornblendite and plagiogranite. in the Middle to Late Triassic as inferred from the Whole-rock geochemical data suggest that all mafic metamorphic ages of eclogite and blueschist that occur rocks were formed in an oceanic-ridge setting. nearby.The Paleo-Tethys Ocean was probably formed by Furthermore, positive whole-rock εNd(t) and zircon the breakup of the northern margin of Gondwana, with εHf(t) values suggest that these rocks were derived from southward subduction of the proto-Tethys oceanic a long-term depleted mantle source. The data allow us to lithosphere along the northern margin of the conform that these rocks represent an ophiolite suite. supercontinent. Zircon U-Pb dating of gabbros and plagiogranites Corresponding author.E-mail:zhaiqingguo@126.com http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Geologica Sinica (English Edition) Wiley

The Open of the Paleo‐Tethys Ocean: Inferred from the Early Paleozoic Ophiolite in the Qiangtang Area, Northern Tibetan Plateau

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Publisher
Wiley
Copyright
"© 2019 Geological Society of China"
ISSN
1000-9515
eISSN
1755-6724
DOI
10.1111/1755-6724.14184
Publisher site
See Article on Publisher Site

Abstract

The Paleo-Tethys Ocean was a Paleozoic ocean yielded weighted mean ages of 437-501 Ma. The located between the Gondwana and Laurasia occurrence of the ophiolite suite suggests that a supercontinents. It was usually consider to opening in the Paleozoic Ocean basin (Paleo-Tethys) existed in middle early Paleozoic with the rifting of the Hun superterrane of the Qiangtang terrane. We hypothesize that the from Gondwana following the subduction of the Rheic ophiolite in the middle of the Qiangtang terrane Ocean/proto-Tethys Ocean. However, the opening time represents the western extension of the Sanjiang and detailed evolutionary history of the Paleo-Tethys Paleo-Tethys ophiolite in the east margin of the Tibetan Ocean are still unclear. The Paleozoic ophiolites have Plateau, and they mark the main Paleo-Tethys Ocean. recently been documented in the middle of the Qiangtang This is the oldest ophiolite from the Paleo-Tethyan suture terrane, northern Tibetan Plateau, and they mainly occur zones and the Paleo-Tethys Ocean basin probably in the Gangma Co area. These ophiolites are composed opened in the Middle Cambrian, and continued to grow of serpentinite, pyroxenite, isotropic and cumulate throughout the Paleozoic. The ocean was finally closed gabbros, basalt, hornblendite and plagiogranite. in the Middle to Late Triassic as inferred from the Whole-rock geochemical data suggest that all mafic metamorphic ages of eclogite and blueschist that occur rocks were formed in an oceanic-ridge setting. nearby.The Paleo-Tethys Ocean was probably formed by Furthermore, positive whole-rock εNd(t) and zircon the breakup of the northern margin of Gondwana, with εHf(t) values suggest that these rocks were derived from southward subduction of the proto-Tethys oceanic a long-term depleted mantle source. The data allow us to lithosphere along the northern margin of the conform that these rocks represent an ophiolite suite. supercontinent. Zircon U-Pb dating of gabbros and plagiogranites Corresponding author.E-mail:zhaiqingguo@126.com

Journal

Acta Geologica Sinica (English Edition) – Wiley

Published: May 1, 2019

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