Geochronology and petrogenesis of the Pan-African granitoids from Mbondo-Ngazi Tina in the Adamawa-Yade Domain, Central Cameroon

doi:10.1007/s00531-021-02071-3

IOCAS-IR

	Geochronology and petrogenesis of the Pan-African granitoids from Mbondo-Ngazi Tina in the Adamawa-Yade Domain, Central Cameroon
	Ngoniri, Alexis Hamdja 1; Tamehe, Landry Soh 2,3; Ganno, Sylvestre 2; Ngnotue, Timoleon 1; Chen, Zuxing 4; Li, Huan 3; Kenne, Patrick Ayonta 1; Nzenti, Jean Paul 2
	2021-06-20
发表期刊	INTERNATIONAL JOURNAL OF EARTH SCIENCES
ISSN	1437-3254
页码	25
通讯作者	Ganno, Sylvestre(sganno2000@gmail.com) ; Ngnotue, Timoleon(tngnotue@yahoo.fr)
摘要	The Mbondo-Ngazi Tina area belongs to the eastern part of the Adamawa-Yade Domain (AYD), which corresponds to the central domain of the Central African Fold Belt (CAFB) in Cameroon. This area comprises three groups of granitoids including granites, syenites, and diorites, which are chemically similar to quartz monzonites and nepheline syenites, and monzodiorites, respectively. These granitoids are metaluminous and I-type rocks, with the dioritic rocks being ferroan and high-K calc-alkaline, while others are magnesian and shoshonitic rocks. The Ti-in-zircon thermometer suggests crystallization temperatures of 678-811 degrees C and 658-768 degrees C for monzonites and syenites, respectively. Their zircon trace element distribution and patterns coupled to the whole-rock geochemical features indicate that the Mbondo-Ngazi Tina granitoids were most likely originated from the mixture between crust- and mantle-derived melts, with high crustal portion for the quartz monzonites and nepheline syenites, and strong involvement of mantle component for the monzodiorites. The Ce/Ce, Eu/Eu, Th/U, and Zr/Hf of zircons suggest that the crystallization of magma melts took place under variable oxidizing and oxygen fugacity conditions at temperature of 678-768 degrees C. LA-ICP-MS U-Pb zircon analyses yield emplacement age of 576.4 +/- 1.9 Ma and 585.9 +/- 2.1 Ma for the quartz monzonites and nepheline syenites, respectively. These ages suggest that these rocks are post-tectonic granitoids emplaced during relaxation stages after the collision between the Amazonian-West African cratons and the Sao Francisco-Congo and Saharan cratons. The post-collisional extensional regime is related to the development of large shear zones across the Pan-African/Brasiliano belts, which played a role for the ascent and emplacement of post-tectonic granitoids in response to lithospheric delamination. This explains that such granitic plutons are widespread in the CAFB and adjacent Brasiliano belt.
关键词	Pan-African orogeny Adamawa-Yade domain Granitoids Geochemistry Zircon U-Pb geochronology
DOI	10.1007/s00531-021-02071-3
收录类别	SCI
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000663693900001
出版者	SPRINGER
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/176898
专题	中国科学院海洋研究所
通讯作者	Ganno, Sylvestre; Ngnotue, Timoleon
作者单位	1.Univ Dschang, Dept Earth Sci, POB 67, Dschang, Cameroon 2.Univ Yaounde I, Dept Earth Sci, POB 812, Yaounde, Cameroon 3.Cent South Univ, Sch Geosci & Infophys, Changsha 410083, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Shandong, Peoples R China
推荐引用方式 GB/T 7714	Ngoniri, Alexis Hamdja,Tamehe, Landry Soh,Ganno, Sylvestre,et al. Geochronology and petrogenesis of the Pan-African granitoids from Mbondo-Ngazi Tina in the Adamawa-Yade Domain, Central Cameroon[J]. INTERNATIONAL JOURNAL OF EARTH SCIENCES,2021:25.
APA	Ngoniri, Alexis Hamdja.,Tamehe, Landry Soh.,Ganno, Sylvestre.,Ngnotue, Timoleon.,Chen, Zuxing.,...&Nzenti, Jean Paul.(2021).Geochronology and petrogenesis of the Pan-African granitoids from Mbondo-Ngazi Tina in the Adamawa-Yade Domain, Central Cameroon.INTERNATIONAL JOURNAL OF EARTH SCIENCES,25.
MLA	Ngoniri, Alexis Hamdja,et al."Geochronology and petrogenesis of the Pan-African granitoids from Mbondo-Ngazi Tina in the Adamawa-Yade Domain, Central Cameroon".INTERNATIONAL JOURNAL OF EARTH SCIENCES (2021):25.

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