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Geochemical Characteristics and Geological Significance of Early Permian Baya'ertuhushuo Gabbro in South Great Xing'an Range

Geochemical Characteristics and Geological Significance of Early Permian Baya'ertuhushuo Gabbro... Abstract: Field geological investigation and geochemical analysis are carried out on Baya'ertuhushuo Gabbro in South Great Xing'an Range. Field investigation reveals that the gabbro is a magmatic intrusion rather than a component of an ophiolite suite as previously thought. Zircon laser ablation inductively coupled plasma mass spectroscopy (LA‐ICP‐MS) U‐Pb dating indicates the gabbro was formed in 274–275 Ma, just as the widespread volcanic rocks of Dashizhai Formation (P1d), monzogranites and miarolitic alkali‐feldspar granites in the study area. The gabbro has SiO2 content between 47.23 wt% and 50.17 wt%, high MgO and FeOT contents of 6.95–11.29 wt% and 7.32–12.24 wt%, respectively, and it belongs to low‐K tholeiitic series in the SiO2‐K2O diagram. The Chondrite‐normalized rare earth element (REE) patterns and primitive mantle‐normalized spider diagrams of the gabbro are similar to those of Normal Mid‐Ocean Ridge Basalt (N‐MORB) except for the enrichment of large ion lithophile elements (LILE), such as Rb, Ba and K. In trace element tectonic discriminative diagrams, the samples are mainly plotted in the N‐MORB field, and Zircon in situ Lu‐Hf isotopic analysis also indicates the gabbro originated from depleted mantle. Through synthetic studies of the geochemical characteristics and petrogenesis of Baya'ertuhushuo gabbro, volcanic rocks of Dashizhai Formation and granitoids in the area, it is suggested that the early Permian magmatism in the Xilinhot‐Xiwuqi area formed in the tectonic setting of asthenosphere upwelling, which was caused by breaking‐off of the subducted Paleo‐Asian Ocean slab. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Geologica Sinica (English Edition) Wiley

Geochemical Characteristics and Geological Significance of Early Permian Baya'ertuhushuo Gabbro in South Great Xing'an Range

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References (51)

Publisher
Wiley
Copyright
© 2011 Geological Society of China
ISSN
1000-9515
eISSN
1755-6724
DOI
10.1111/j.1755-6724.2011.00384.x
Publisher site
See Article on Publisher Site

Abstract

Abstract: Field geological investigation and geochemical analysis are carried out on Baya'ertuhushuo Gabbro in South Great Xing'an Range. Field investigation reveals that the gabbro is a magmatic intrusion rather than a component of an ophiolite suite as previously thought. Zircon laser ablation inductively coupled plasma mass spectroscopy (LA‐ICP‐MS) U‐Pb dating indicates the gabbro was formed in 274–275 Ma, just as the widespread volcanic rocks of Dashizhai Formation (P1d), monzogranites and miarolitic alkali‐feldspar granites in the study area. The gabbro has SiO2 content between 47.23 wt% and 50.17 wt%, high MgO and FeOT contents of 6.95–11.29 wt% and 7.32–12.24 wt%, respectively, and it belongs to low‐K tholeiitic series in the SiO2‐K2O diagram. The Chondrite‐normalized rare earth element (REE) patterns and primitive mantle‐normalized spider diagrams of the gabbro are similar to those of Normal Mid‐Ocean Ridge Basalt (N‐MORB) except for the enrichment of large ion lithophile elements (LILE), such as Rb, Ba and K. In trace element tectonic discriminative diagrams, the samples are mainly plotted in the N‐MORB field, and Zircon in situ Lu‐Hf isotopic analysis also indicates the gabbro originated from depleted mantle. Through synthetic studies of the geochemical characteristics and petrogenesis of Baya'ertuhushuo gabbro, volcanic rocks of Dashizhai Formation and granitoids in the area, it is suggested that the early Permian magmatism in the Xilinhot‐Xiwuqi area formed in the tectonic setting of asthenosphere upwelling, which was caused by breaking‐off of the subducted Paleo‐Asian Ocean slab.

Journal

Acta Geologica Sinica (English Edition)Wiley

Published: Feb 1, 2011

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