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Petrology and geochemistry of TTG and K-rich Paleoproterozoic Birimian granitoids of the West African Craton (Ghana): Petrogenesis and tectonic implications

文献类型：期刊论文

作者Sakyi, Patrick Asamoah6; Addae, Rauda Adam5,6; Su, Ben-Xun4; Dampare, Samuel Boakye3; Abitty, Emmanuel2; Su, Ben-Can1; Liu, Bin1; Asiedu, Daniel Kwadwo6
刊名PRECAMBRIAN RESEARCH
出版日期2020
卷号336页码:22
关键词Paleoproterozoic Birimian TTGs K-rich granitoids West African Craton Bole-Nangodi Belt
ISSN号0301-9268
DOI10.1016/j.precamres.2019.105492
英文摘要We conducted petrologic, geochemical and isotopic studies on Paleoproterozoic Birimian granitoids that intrude the Bole-Nangodi Belt in northern Ghana, in southeastern West African Craton (WAC), to constrain the geodynamic evolution of the Birimian Supergroup. The rocks are potassic (K)-rich granitoids (KRGs), tonalities, trondhjemites, granodiorites (TTGs), pegmatite and aplite. The K2O contents of the KRGs are up to 5 wt%, with generally high concentrations of Rb, Ba, Sr, Cr and Ni. They are highly fractionated talc-alkaline I-type granitoids, enriched in LILE and LREE relative to HREE and HFSE. Chondrite-normalized REE diagrams indicate fractionated LREE (average La-N/Sm-N = 5.05) and HREE (Gd-N/Yb-N = 4.56) patterns, with slight negative Eu anomalies (average Eu/Eu* = 0.75). This may indicate an evolved magma source with varying degrees of plagioclase fractionation. The KRGs share similar geochemical characteristics with the TTGs into which they intrude. Both rock types are characterized by Ba and Th enrichment and depletion in Nb-Ta, Zr-Hf, and Ti, which are typical characteristics of subduction-related magmas. The pegmatite-aplite association is slightly geochemically different and may have formed at a time later than the KRGs. The epsilon(Nd)(2.1 Ga) values range from + 0.90 to + L24 and -0.86 to + 1.37 respectively for the TTGs and KRGs, with T-DM1 ages of 2.34-2.38 Ga and 2.36-2.53 Ga and T-DM2 ages of 2.21-2.24 Ga and 2.22-2.39 Ga respectively. These indicate their juvenile character, possibly a depleted mantle source with minor contributions from a pre-Birimian (or Archean?) crustal material in their source material(s). The TTGs and KRGs are volcanic arc granites (VAG) and syn-collisional (Syn-COLG) granites, with formation temperatures and pressures of similar to 640-750 degrees C and similar to 2-6 kbar respectively. Based on the high temperatures, I-type signature, calc-alkaline nature and other geochemical characteristics, we infer that the TTGs, KRGs and pegmatite-aplite association developed under high oxygen fugacity conditions in an orogenic tectonic setting related to subduction. Thus, our geochemical and isotopic results are consistent with an island arc tectonic setting arising from subduction-accretion processes, which are typical for the Paleoproterozoic terranes of the WAC. These processes may have contributed to the amalgamation of the Columbia (Nuna) supercontinent during the Paleoproterozoic (2.1-1.8 Ga) orogeny.
WOS关键词PALAEOPROTEROZOIC EBURNEAN OROGENY ; LOWER CRUST EXHUMATION ; CALC-ALKALINE ; U-PB ; GREENSTONE-BELT ; VOLCANIC BELT ; EXPERIMENTAL CALIBRATION ; NORTHERN TANZANIA ; CONTINENTAL-CRUST ; TRACE-ELEMENTS
资助项目University of Ghana Research Fund[UGRF/18/1LG-044/2014-2015] ; Youth Innovation Promotion Association, Chinese Academy of Sciences[2016067] ; University of Ghana Earth Science Capacity Building Project
WOS研究方向Geology
语种英语
WOS记录号WOS:000508748600006
出版者ELSEVIER
资助机构University of Ghana Research Fund ; University of Ghana Research Fund ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; University of Ghana Earth Science Capacity Building Project ; University of Ghana Earth Science Capacity Building Project ; University of Ghana Research Fund ; University of Ghana Research Fund ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; University of Ghana Earth Science Capacity Building Project ; University of Ghana Earth Science Capacity Building Project ; University of Ghana Research Fund ; University of Ghana Research Fund ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; University of Ghana Earth Science Capacity Building Project ; University of Ghana Earth Science Capacity Building Project ; University of Ghana Research Fund ; University of Ghana Research Fund ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; University of Ghana Earth Science Capacity Building Project ; University of Ghana Earth Science Capacity Building Project
源URL[http://ir.iggcas.ac.cn/handle/132A11/95898]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Sakyi, Patrick Asamoah
作者单位1.Changqing Oil Field Co, Oil Prod Plant 8, Xian 710018, Peoples R China
2.Univ Perugia, Dipartimento Fis & Geol, I-06123 Perugia, Italy
3.Univ Ghana, Sch Nucl & Allied Sci, Kwabenya Accra, Ghana
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, POB 9825, Beijing 100029, Peoples R China
5.Ghana Geol Survey Author, POB M80, Accra, Ghana
6.Univ Ghana, Sch Phys & Math Sci, Dept Earth Sci, Legon, Ghana
推荐引用方式
GB/T 7714		 Sakyi, Patrick Asamoah,Addae, Rauda Adam,Su, Ben-Xun,et al. Petrology and geochemistry of TTG and K-rich Paleoproterozoic Birimian granitoids of the West African Craton (Ghana): Petrogenesis and tectonic implications[J]. PRECAMBRIAN RESEARCH,2020,336:22.
APA Sakyi, Patrick Asamoah.,Addae, Rauda Adam.,Su, Ben-Xun.,Dampare, Samuel Boakye.,Abitty, Emmanuel.,...&Asiedu, Daniel Kwadwo.(2020).Petrology and geochemistry of TTG and K-rich Paleoproterozoic Birimian granitoids of the West African Craton (Ghana): Petrogenesis and tectonic implications.PRECAMBRIAN RESEARCH,336,22.
MLA Sakyi, Patrick Asamoah,et al."Petrology and geochemistry of TTG and K-rich Paleoproterozoic Birimian granitoids of the West African Craton (Ghana): Petrogenesis and tectonic implications".PRECAMBRIAN RESEARCH 336(2020):22.

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来源：地质与地球物理研究所

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