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Eocene magmatic processes and crustal thickening in southern Tibet: insights from strongly fractionated ca. 43 Ma granites in the western Gangdese Batholith

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Eocene magmatic processes and crustal thickening in southern Tibet : insights from strongly fractionated ca. 43 Ma granites in the western Gangdese Batholith. / Wang, Qing; Zhu, Di-Cheng; Cawood, Peter Anthony; Zhao, Zhi-Dan; Liu, Sheng-Ao; Chung, Sun-Lin; Zhang, Liang-Liang; Liu, Dong; Zheng, Yuan-Chuan; Dai, Jin-Gen.

In: Lithos, Vol. In press, 2015.

Research output: Contribution to journalArticle

Harvard

Wang, Q, Zhu, D-C, Cawood, PA, Zhao, Z-D, Liu, S-A, Chung, S-L, Zhang, L-L, Liu, D, Zheng, Y-C & Dai, J-G 2015, 'Eocene magmatic processes and crustal thickening in southern Tibet: insights from strongly fractionated ca. 43 Ma granites in the western Gangdese Batholith' Lithos, vol. In press. https://doi.org/10.1016/j.lithos.2015.10.003

APA

Wang, Q., Zhu, D-C., Cawood, P. A., Zhao, Z-D., Liu, S-A., Chung, S-L., ... Dai, J-G. (2015). Eocene magmatic processes and crustal thickening in southern Tibet: insights from strongly fractionated ca. 43 Ma granites in the western Gangdese Batholith. Lithos, In press. https://doi.org/10.1016/j.lithos.2015.10.003

Vancouver

Wang Q, Zhu D-C, Cawood PA, Zhao Z-D, Liu S-A, Chung S-L et al. Eocene magmatic processes and crustal thickening in southern Tibet: insights from strongly fractionated ca. 43 Ma granites in the western Gangdese Batholith. Lithos. 2015;In press. https://doi.org/10.1016/j.lithos.2015.10.003

Author

Wang, Qing ; Zhu, Di-Cheng ; Cawood, Peter Anthony ; Zhao, Zhi-Dan ; Liu, Sheng-Ao ; Chung, Sun-Lin ; Zhang, Liang-Liang ; Liu, Dong ; Zheng, Yuan-Chuan ; Dai, Jin-Gen. / Eocene magmatic processes and crustal thickening in southern Tibet : insights from strongly fractionated ca. 43 Ma granites in the western Gangdese Batholith. In: Lithos. 2015 ; Vol. In press.

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@article{fc2f93914d1a4661afdacded0e77c11c,
title = "Eocene magmatic processes and crustal thickening in southern Tibet: insights from strongly fractionated ca. 43 Ma granites in the western Gangdese Batholith",
abstract = "This study reports zircon U-Pb age and Hf isotope, whole-rock major and trace element, and Sr-Nd-Pb-Hf isotope data for the Dajia pluton, western Gangdese Batholith, in southern Tibet. These data indicate that the pluton consists of moderately (Group 1) and strongly (Group 2) fractionated granites that were emplaced synchronously at ca. 43 Ma. The Group 1 samples have SiO2 contents of 69−72 wt.{\%} and vary in terms of the differentiation index (DI = 84−93). These rocks are depleted in Ba, Nb, Sr, P, and Ti, with moderate negative Eu anomalies, and display low heavy rare earth elements (HREEs) and Y abundances. The Group 2 samples are characterized by high SiO2 (75−78 wt.{\%}) and DI (95−97); significantly negative Eu anomalies; marked concave-upward middle REE (Gd-Ho) patterns; and Ba, Sr, P, and Ti anomalies that are significantly more negative than those of the Group 1 samples. The Group 1 samples have whole-rock εNd(t) (-5.9 to -6.0), εHf(t) (-4.0 to -4.5), and zircon εHf(t) (-6.0 to + 5.8) values identical to those of the Group 2 samples [εNd(t) = -5.7 to -6.7, εHf(t) = -3.5 to -2.9, and zircon εHf(t) = -2.0 to + 4.2], as well as similar initial Pb isotopic compositions. These data indicate that the two groups were derived from a common source region with garnet as a residual mineral phase. The Group 1 samples were most likely derived from partial melting of garnet-bearing amphibolite (rather than eclogite) within the juvenile southern Lhasa crust and mixed with the enriched components from the subducting ancient Indian continental crust and/or the ancient central Lhasa basement. The Group 2 samples are interpreted as the products of extensive fractional crystallization (plagioclase, K-feldspar, biotite, apatite, allanite, titanite, monazite, and ilmenite) of the melts represented by the Group 1 samples. Low HREEs and Y abundances of the Dajia pluton, together with the presence of strongly fractionated granites (Group 2) identified for the first time in the Gangdese Batholith, indicate that the crust beneath the Dajia region had already been thickened by ca. 43 Ma. High whole-rock zircon saturation temperatures (815°C−869°C) of the Group 1 samples and the other ca. 43 Ma coeval magmatism documented both in the Gangdese Batholith and in the Tethyan Himalaya can be best interpreted as the final consequences of the magmatic responses to the Neo-Tethyan oceanic slab breakoff.",
keywords = "Mid-Eocene, Strongly fractionated granites, Crustal thickening, Gangdese Batholith, Southern Tibet",
author = "Qing Wang and Di-Cheng Zhu and Cawood, {Peter Anthony} and Zhi-Dan Zhao and Sheng-Ao Liu and Sun-Lin Chung and Liang-Liang Zhang and Dong Liu and Yuan-Chuan Zheng and Jin-Gen Dai",
note = "This research was financially co-supported by the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (XDB03010301), the National Key Project for Basic Research of China (Project 2015CB452604), the Chinese National Natural Science Foundation (41225006, 41472061, and 40973026), the MOST Special Fund from the State Key Laboratory of Geological Processes and Mineral Resources (China University of Geosciences). The first author thanks the China Scholarship Council (201306400021).",
year = "2015",
doi = "10.1016/j.lithos.2015.10.003",
language = "English",
volume = "In press",
journal = "Lithos",
issn = "0024-4937",
publisher = "Elsevier Science BV",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Eocene magmatic processes and crustal thickening in southern Tibet

T2 - Lithos

AU - Wang, Qing

AU - Zhu, Di-Cheng

AU - Cawood, Peter Anthony

AU - Zhao, Zhi-Dan

AU - Liu, Sheng-Ao

AU - Chung, Sun-Lin

AU - Zhang, Liang-Liang

AU - Liu, Dong

AU - Zheng, Yuan-Chuan

AU - Dai, Jin-Gen

N1 - This research was financially co-supported by the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (XDB03010301), the National Key Project for Basic Research of China (Project 2015CB452604), the Chinese National Natural Science Foundation (41225006, 41472061, and 40973026), the MOST Special Fund from the State Key Laboratory of Geological Processes and Mineral Resources (China University of Geosciences). The first author thanks the China Scholarship Council (201306400021).

PY - 2015

Y1 - 2015

N2 - This study reports zircon U-Pb age and Hf isotope, whole-rock major and trace element, and Sr-Nd-Pb-Hf isotope data for the Dajia pluton, western Gangdese Batholith, in southern Tibet. These data indicate that the pluton consists of moderately (Group 1) and strongly (Group 2) fractionated granites that were emplaced synchronously at ca. 43 Ma. The Group 1 samples have SiO2 contents of 69−72 wt.% and vary in terms of the differentiation index (DI = 84−93). These rocks are depleted in Ba, Nb, Sr, P, and Ti, with moderate negative Eu anomalies, and display low heavy rare earth elements (HREEs) and Y abundances. The Group 2 samples are characterized by high SiO2 (75−78 wt.%) and DI (95−97); significantly negative Eu anomalies; marked concave-upward middle REE (Gd-Ho) patterns; and Ba, Sr, P, and Ti anomalies that are significantly more negative than those of the Group 1 samples. The Group 1 samples have whole-rock εNd(t) (-5.9 to -6.0), εHf(t) (-4.0 to -4.5), and zircon εHf(t) (-6.0 to + 5.8) values identical to those of the Group 2 samples [εNd(t) = -5.7 to -6.7, εHf(t) = -3.5 to -2.9, and zircon εHf(t) = -2.0 to + 4.2], as well as similar initial Pb isotopic compositions. These data indicate that the two groups were derived from a common source region with garnet as a residual mineral phase. The Group 1 samples were most likely derived from partial melting of garnet-bearing amphibolite (rather than eclogite) within the juvenile southern Lhasa crust and mixed with the enriched components from the subducting ancient Indian continental crust and/or the ancient central Lhasa basement. The Group 2 samples are interpreted as the products of extensive fractional crystallization (plagioclase, K-feldspar, biotite, apatite, allanite, titanite, monazite, and ilmenite) of the melts represented by the Group 1 samples. Low HREEs and Y abundances of the Dajia pluton, together with the presence of strongly fractionated granites (Group 2) identified for the first time in the Gangdese Batholith, indicate that the crust beneath the Dajia region had already been thickened by ca. 43 Ma. High whole-rock zircon saturation temperatures (815°C−869°C) of the Group 1 samples and the other ca. 43 Ma coeval magmatism documented both in the Gangdese Batholith and in the Tethyan Himalaya can be best interpreted as the final consequences of the magmatic responses to the Neo-Tethyan oceanic slab breakoff.

AB - This study reports zircon U-Pb age and Hf isotope, whole-rock major and trace element, and Sr-Nd-Pb-Hf isotope data for the Dajia pluton, western Gangdese Batholith, in southern Tibet. These data indicate that the pluton consists of moderately (Group 1) and strongly (Group 2) fractionated granites that were emplaced synchronously at ca. 43 Ma. The Group 1 samples have SiO2 contents of 69−72 wt.% and vary in terms of the differentiation index (DI = 84−93). These rocks are depleted in Ba, Nb, Sr, P, and Ti, with moderate negative Eu anomalies, and display low heavy rare earth elements (HREEs) and Y abundances. The Group 2 samples are characterized by high SiO2 (75−78 wt.%) and DI (95−97); significantly negative Eu anomalies; marked concave-upward middle REE (Gd-Ho) patterns; and Ba, Sr, P, and Ti anomalies that are significantly more negative than those of the Group 1 samples. The Group 1 samples have whole-rock εNd(t) (-5.9 to -6.0), εHf(t) (-4.0 to -4.5), and zircon εHf(t) (-6.0 to + 5.8) values identical to those of the Group 2 samples [εNd(t) = -5.7 to -6.7, εHf(t) = -3.5 to -2.9, and zircon εHf(t) = -2.0 to + 4.2], as well as similar initial Pb isotopic compositions. These data indicate that the two groups were derived from a common source region with garnet as a residual mineral phase. The Group 1 samples were most likely derived from partial melting of garnet-bearing amphibolite (rather than eclogite) within the juvenile southern Lhasa crust and mixed with the enriched components from the subducting ancient Indian continental crust and/or the ancient central Lhasa basement. The Group 2 samples are interpreted as the products of extensive fractional crystallization (plagioclase, K-feldspar, biotite, apatite, allanite, titanite, monazite, and ilmenite) of the melts represented by the Group 1 samples. Low HREEs and Y abundances of the Dajia pluton, together with the presence of strongly fractionated granites (Group 2) identified for the first time in the Gangdese Batholith, indicate that the crust beneath the Dajia region had already been thickened by ca. 43 Ma. High whole-rock zircon saturation temperatures (815°C−869°C) of the Group 1 samples and the other ca. 43 Ma coeval magmatism documented both in the Gangdese Batholith and in the Tethyan Himalaya can be best interpreted as the final consequences of the magmatic responses to the Neo-Tethyan oceanic slab breakoff.

KW - Mid-Eocene

KW - Strongly fractionated granites

KW - Crustal thickening

KW - Gangdese Batholith

KW - Southern Tibet

U2 - 10.1016/j.lithos.2015.10.003

DO - 10.1016/j.lithos.2015.10.003

M3 - Article

VL - In press

JO - Lithos

JF - Lithos

SN - 0024-4937

ER -

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