In situ mineral chemistry of chlorite in Donghua area, Dehua-Youxi-Yongtai ore district, Fujian Province, south-east China: Elemental characteristics and their implications for exploration

doi:10.1002/gj.4349

GIG OpenIR

	Niu, Si-Da 1,2; Guo, Jian 1; Xing, Guang-Fu 3; Huang, Zhao-Qiang 1; Wu, Hua-Ying 1,2; Fan, Fei-Peng 4; Xiao, Bing 5
	In situ mineral chemistry of chlorite in Donghua area, Dehua-Youxi-Yongtai ore district, Fujian Province, south-east China: Elemental characteristics and their implications for exploration
刊名	GEOLOGICAL JOURNAL
ISSN号	0072-1050
	2021-12-08
页码	17
DOI	10.1002/gj.4349
语种	英语
WOS研究方向	Geology
摘要	As an ordinary alteration mineral in the process of fluid-rock interaction, chlorite (most especially its chemical composition) has the potential to become an effective tool to reveal the physicochemical conditions during alteration and help exploration. However, its elemental characteristics during the chloritization process are yet to be clearly understood. The Dehua-Youxi-Yongtai (DYY) ore district in south-east China is one of the potential areas of gold and polymetallic deposits. Lying in the north-west section of the DYY ore district, the Donghua area is notable for its remarkable metallogenic potential, and porphyry-epithermal systems might have developed in the area. This study focuses on the elemental characteristics of chlorite in the Donghua area as footprints of the alteration process and mineralization vectoring. According to the geological features and occurrences, the chlorite from Donghua can be divided into two generations: (a) Chlorite I is closely related to chloritization developed in intrusive and volcanic rocks (Permian quartz monzobiorite and Jurassic volcanic rocks of Changlin Formation), and (b) chlorite II is accompanied by superimposed hydrothermal overprinting. The alteration process suggested by overprinting chlorite II can be regarded as almost coeval with the ca. 154-153 Ma magmatic event, and chlorite H is later than chlorite I generation. According to the geothermometry of the chlorite in Donghua, chlorite I might have crystallized on the temperature of 180-240 degrees C with a peak of similar to 200 degrees C, and the overprinting chlorite II might have experienced two episodes of hydrothermal/epithermal fluid pulsing. The mineral geochemistry of the trace elements in the two generations of the chlorite in Donghua shows different characteristics. The replacement of Mg2+ by Fe2+ plays an important role for ionic substitution in the octahedral position, especially for chlorite H. The other occasion might be Mg and Fe jointly entering the octahedral position as well as Mg- and Fe-Al-VI substitution mechanisms. The enrichment of Mg especially in chlorite II suggests low-grade oxidation and acid conditions, which might be beneficial for the transportation of metallogenic substances. The obvious differences of Co and Ni are remarkable aspects of the trace elements of chlorite in Donghua, resulted by the ion substitution and function of different octahedral site preference energy. The mineral chemistry of chlorite II from Donghua can be helpful for targeting and exploration vectoring in the DYY ore district.
关键词	chlorite elemental characteristics exploration Fujian in situ mineral chemistry
WOS记录号	WOS:000728694800001
收录类别	SCI
引用统计
文献类型	期刊论文
条目标识符	http://ir.gig.ac.cn/handle/344008/65377
通讯作者	Guo, Jian; Xing, Guang-Fu
作者单位	1.China Met Geol Bur, Inst Mineral Resources Res, Beijing 101300, Peoples R China 2.China Met Geol Bur, Mineral Comprehens Utilizat Res & Dev Ctr, Beijing, Peoples R China 3.China Geol Survey, Wuhan Ctr, Wuhan 430205, Hubei, Peoples R China 4.China Geol Survey, Nanjing Ctr, Nanjing, Peoples R China 5.Chinese Acad Sci, Key Lab Mineral & Metallogeny, Guangzhou Inst Geochem, Guangzhou, Peoples R China
推荐引用方式 GB/T 7714	Niu, Si-Da,Guo, Jian,Xing, Guang-Fu,et al. In situ mineral chemistry of chlorite in Donghua area, Dehua-Youxi-Yongtai ore district, Fujian Province, south-east China: Elemental characteristics and their implications for exploration[J]. GEOLOGICAL JOURNAL,2021:17.
APA	Niu, Si-Da.,Guo, Jian.,Xing, Guang-Fu.,Huang, Zhao-Qiang.,Wu, Hua-Ying.,...&Xiao, Bing.(2021).In situ mineral chemistry of chlorite in Donghua area, Dehua-Youxi-Yongtai ore district, Fujian Province, south-east China: Elemental characteristics and their implications for exploration.GEOLOGICAL JOURNAL,17.
MLA	Niu, Si-Da,et al."In situ mineral chemistry of chlorite in Donghua area, Dehua-Youxi-Yongtai ore district, Fujian Province, south-east China: Elemental characteristics and their implications for exploration".GEOLOGICAL JOURNAL (2021):17.