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Presence of Permian extension- and arc-type magmatism in southern Tibet; paleogeographic implications

Zhu Dicheng, Mo Xuanxue, Zhao Zhidan, Yaoling Niu, Wang Liquan, Qiu-Hong Chu, Pan Guitang, Xu Jifeng and Zhou Changyong
Presence of Permian extension- and arc-type magmatism in southern Tibet; paleogeographic implications
Geological Society of America Bulletin (July 2010) 122 (7-8): 979-993

Abstract

The geographical location of the Lhasa terrane in the Permian remains a subject of debate. The recognition of the Permian basalts in the Tethyan Himalaya and the Permian volcanic rocks in the Lhasa terrane in southern Tibet together with the geochemistry of these rocks offer some new insights. The Permian basalts in the Tethyan Himalaya show a geochemical affinity with tholeiitic continental flood basalts, and are interpreted to have formed in an extensional setting. The new geochemical data and the geographical distribution of these basalts indicate that they probably represent the easternmost extent of the Panjal continental flood basalt province. All of the Permian basalts in the Lhasa terrane show a calc-alkaline, high-alumina basalt affinity, with significant negative Nb-Ta-Ti anomalies. These geochemical features, combined with the recent documentation of the Permian Songdo eclogite and sedimentological observations, indicate the existence of a subduction system beneath the central Lhasa subterrane in the Permian. The presence of both extension- and arc-type magmatism of Permian age in present-day southern Tibet is inconsistent with the general view that the Lhasa terrane did not rift away from the northern margin of the Greater India until the Late Permian or Triassic. Instead, we suggest that the central Lhasa subterrane may have been a microcontinent isolated in the Paleo-Tethyan Ocean basin, at least during the Carboniferous-Middle Permian time.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 122
Serial Issue: 7-8
Title: Presence of Permian extension- and arc-type magmatism in southern Tibet; paleogeographic implications
Affiliation: China University of Geosciences, State Key Laboratory of Geological Processes and Mineral Resources, Beijing, China
Pages: 979-993
Published: 201007
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 105
Accession Number: 2010-050180
Categories: Igneous and metamorphic petrologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2010048
Illustration Description: illus. incl. strat. col., geol. sketch map
N28°30'00" - N31°00'00", E85°00'00" - E86°00'00"
Secondary Affiliation: Durham University, GBR, United KingdomChengdu Institute of Geology and Mineral Resources, CHN, ChinaNational Taiwan University, TWN, TaiwanChinese Academy of Sciences, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201027
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