Transitional chromitites within the Maqsad crust-mantle transition zone of the Semail ophiolite formed above the nascent forearc setting

doi:10.1016/j.lithos.2025.108021

	Bo, Rong-Zhong 1; Cai, Peng-Jie 1; Lian, Dong-Yang 1; Yang, Jing-Sui 1; Nasir, Sobhi 2; Rui, Hui-Chao 3; Lu, Yu-Xiao 4; Cao, Chu-Qi 5; Masoud, Ahmed E.6,7
	Transitional chromitites within the Maqsad crust-mantle transition zone of the Semail ophiolite formed above the nascent forearc setting
刊名	LITHOS
ISSN号	0024-4937
	2025-06-01
卷号	502 页码:14
DOI	10.1016/j.lithos.2025.108021
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
摘要	The Semail ophiolite is a classic example of a well-preserved ophiolite, hosting over 450 documented podiform chromite deposits. This study investigates a transitional chromitite occurrence in the crust-mantle transition zone (CMTZ) of the Maqsad area within the Sumail massif of the Semail ophiolite. The chromitites, enveloped by dunites, exhibit massive and disseminated textures. Host harzburgites, representing upper mantle residues, underwent similar to 20-35 % partial melting followed by metasomatism from subducting slab-derived melts/fluids. These peridotites show geochemical affinities with Izu-Bonin-Mariana (IBM) forearc peridotites, indicating a forearc tectonic setting. The Maqsad chromitites, with Cr# values of 54.3-66.2, are classified as transitional chromitites. Their geochemical features resemble chromites crystallized from mid-ocean ridge basalt (MORB) melts. Elevated oxygen fugacity (f(O2)) values compared to abyssal peridotites further support their formation in a supra-subduction zone (SSZ)environment. Based on the petrogeological and geochemical characteristics of the host rocks, we propose that the parental magma of the Maqsad transitional chromitites derived from a nascent forearc mantle above an SSZ setting, with MORB-like affinity.
关键词	Semail ophiolite Maqsad diapir Crust-mantle transition zone Transitional chromitite Hydrous MORB-like melts Nascent forearc mantle
WOS记录号	WOS:001440686400001
收录类别	SCI
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.gig.ac.cn/handle/344008/82993
专题	中国科学院矿物学与成矿学重点实验室
通讯作者	Lian, Dong-Yang; Yang, Jing-Sui
作者单位	1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Crit Earth Mat Cycling & Mineral Dep, IMM, Nanjing 210023, Peoples R China 2.Sultan Qaboos Univ, Coll Sci, Dept Earth Sci, Muscat, Oman 3.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Guangdong, Peoples R China 4.China Natl Petr Corp, Xibu Drilling Engn Co, Geol Res Inst, Karamay, Peoples R China 5.PetroChina, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China 6.Tanta Univ, Fac Sci, Geol Dept, Tanta, Egypt 7.Nanjing Hongchuang Explorat Technol Serv Co Ltd, Nanjing 211111, Peoples R China
推荐引用方式 GB/T 7714	Bo, Rong-Zhong,Cai, Peng-Jie,Lian, Dong-Yang,et al. Transitional chromitites within the Maqsad crust-mantle transition zone of the Semail ophiolite formed above the nascent forearc setting[J]. LITHOS,2025,502:14.
APA	Bo, Rong-Zhong.,Cai, Peng-Jie.,Lian, Dong-Yang.,Yang, Jing-Sui.,Nasir, Sobhi.,...&Masoud, Ahmed E..(2025).Transitional chromitites within the Maqsad crust-mantle transition zone of the Semail ophiolite formed above the nascent forearc setting.LITHOS,502,14.
MLA	Bo, Rong-Zhong,et al."Transitional chromitites within the Maqsad crust-mantle transition zone of the Semail ophiolite formed above the nascent forearc setting".LITHOS 502(2025):14.