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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
Sakyi, Patrick Asamoah1; Addae, Rauda Adam1,2; Su, Ben-Xun3; Dampare, Samuel Boakye4; Abitty, Emmanuel5; Su, Ben-Can6; Liu, Bin6; Asiedu, Daniel Kwadwo1
2020
Source PublicationPRECAMBRIAN RESEARCH
ISSN0301-9268
Volume336Pages:22
AbstractWe 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.
KeywordPaleoproterozoic Birimian TTGs K-rich granitoids West African Craton Bole-Nangodi Belt
DOI10.1016/j.precamres.2019.105492
Funding OrganizationUniversity 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
WOS KeywordPALAEOPROTEROZOIC EBURNEAN OROGENY ; LOWER CRUST EXHUMATION ; CALC-ALKALINE ; U-PB ; GREENSTONE-BELT ; VOLCANIC BELT ; EXPERIMENTAL CALIBRATION ; NORTHERN TANZANIA ; CONTINENTAL-CRUST ; TRACE-ELEMENTS
Language英语
Funding ProjectUniversity 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
Funding OrganizationUniversity 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
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000508748600006
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95898
Collection矿产资源研究院重点实验室
Corresponding AuthorSakyi, Patrick Asamoah
Affiliation1.Univ Ghana, Sch Phys & Math Sci, Dept Earth Sci, Legon, Ghana
2.Ghana Geol Survey Author, POB M80, Accra, Ghana
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, POB 9825, Beijing 100029, Peoples R China
4.Univ Ghana, Sch Nucl & Allied Sci, Kwabenya Accra, Ghana
5.Univ Perugia, Dipartimento Fis & Geol, I-06123 Perugia, Italy
6.Changqing Oil Field Co, Oil Prod Plant 8, Xian 710018, Peoples R China
Recommended Citation
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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