Characteristics of Micas from Sericitolite of the Gongpoquan and Baishantang Deposits, Beishan Area by Scanning Electron Microscope, X-ray Diffraction and Electron Microprobe Analyses

YE Mei-fang; LIU San; XIE Gu-wei; ZHAO Hui-bo; ZHOU Ning-chao; WEI Xiao-yan; YANG Jian-guo; HOU Hong; WANG Lei; WANG Yi

doi:10.15898/j.cnki.11-2131/td.2016.02.009

2016 Vol. 35, No. 2

Article Contents

Article navigation > Rock and Mineral Analysis > 2016 > 35(2): 166-177

Next Article Previous Article

YE Mei-fang, LIU San, XIE Gu-wei, ZHAO Hui-bo, ZHOU Ning-chao, WEI Xiao-yan, YANG Jian-guo, HOU Hong, WANG Lei, WANG Yi. Characteristics of Micas from Sericitolite of the Gongpoquan and Baishantang Deposits, Beishan Area by Scanning Electron Microscope, X-ray Diffraction and Electron Microprobe Analyses[J]. Rock and Mineral Analysis, 2016, 35(2): 166-177. doi: 10.15898/j.cnki.11-2131/td.2016.02.009

Citation:

YE Mei-fang, LIU San, XIE Gu-wei, ZHAO Hui-bo, ZHOU Ning-chao, WEI Xiao-yan, YANG Jian-guo, HOU Hong, WANG Lei, WANG Yi. Characteristics of Micas from Sericitolite of the Gongpoquan and Baishantang Deposits, Beishan Area by Scanning Electron Microscope, X-ray Diffraction and Electron Microprobe Analyses[J]. Rock and Mineral Analysis, 2016, 35(2): 166-177. doi: 10.15898/j.cnki.11-2131/td.2016.02.009

Characteristics of Micas from Sericitolite of the Gongpoquan and Baishantang Deposits, Beishan Area by Scanning Electron Microscope, X-ray Diffraction and Electron Microprobe Analyses

1.
Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, China
2.
Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Ministry of Land and Resources, Xi'an 710054, China
3.
Institute of Exploration & Development, Changqing Oilfield Branch of PetroChina Company, Xi'an 710018, China
4.
National Engineering Laboratory for Exploration and Development of Low-prmeability Oil & Gas Fields, Xi'an 710018, China

Received Date: 18 June 2015

Revised Date: 01 March 2016

Accepted Date: 10 March 2016

Publish Date: 25 February 2016

Abstract

Abstract

The phyllic alteration zone is regarded as one of the most important near-surface markers in mineral exploration of porphyry deposits. The Gongpoquan and Baishantang copper deposits are two typical porphyry deposits in the Beishan metallogenic belt. A comprehensive structural and chemical study for white micas from sericitolites of these two deposits, utilizing polarized microscope, Scanning Electron Microscope (SEM), powder X-ray Diffractometer (XRD) and Electron Microprobe Analyzer (EMPA) is reported in this paper. It was discovered that both 1M polytype common sericites/muscovites and 2M₁ polytype phengites co-exist in the samples. The micas occur as irregular petals, kinked platelets or straight platelets during SEM observation. According to XRD analyses, both 1M and 2M₁ polytypes co-exist with different b₀ values in micas, indicating their different forming conditions. The Si^Ⅳ atoms in micas range from 3.04 to 3.37 and from 3.03 to 3.35 for Gongpoquan and Baishantang deposits, respectively, indicating the co-existence of sericites/muscovites and hydrothermal phengites. The co-existence of two types of white micas in porphyry copper deposits of the Beishan area indicate the rapid changes of ore-forming fluids from higher temperature and acidity to lower temperature and less acidity during mineralization.
- Beishan metallogenic belt /
- porphyry copper deposit /
- sericite /
- phengite /
- Scanning Electron Microscope /
- X-ray Diffraction /
- Electron Microprobe

FullText(HTML)

References

[1]	doi: 10.2113/gsecongeo.65.4.373
[2]	doi: 10.2113/gsecongeo.105.1.3
[3]	http://www.cnki.com.cn/Article/CJFDTOTAL-CCDZ198601015.htm
[4]	doi: 10.1007/BF00521645
[5]	doi: 10.1007/BF00376643
[6]	doi: 10.1007/BF00371166
[7]
[8]	http://www.cnki.com.cn/Article/CJFDTOTAL-YSXB702.002.htm
[9]	http://www.cnki.com.cn/Article/CJFDTOTAL-XDDZ200702014.htm
[10]	http://www.cnki.com.cn/Article/CJFDTOTAL-KWXB200903010.htm
[11]	http://www.cnki.com.cn/Article/CJFDTOTAL-YKCS200201016.htm
[12]	http://www.cnki.com.cn/Article/CJFDTOTAL-YKCS201502006.htm
[13]	http://www.cnki.com.cn/Article/CJFDTOTAL-KWXB200602002.htm
[14]	http://www.cnki.com.cn/Article/CJFDTOTAL-KWXB200502005.htm
[15]	doi: 10.1016/j.oregeorev.2012.12.006
[16]	Li H J, Zhang L F, Christy A G, et al. The Correlation between Raman Spectra and the Mineral Composition of Muscovite and Phengite[M]//Dobrzhinetskaya L F, Faryad S W, Wallis S, et al (Eds. ). Ultrahigh Pressure Metamorphism. London: Elsevier, 2011: 187-212. Google Scholar
[17]
[18]	doi: 10.1007/s00269-011-0417-4
[19]
[20]
[21]	http://www.cnki.com.cn/Article/CJFDTOTAL-ZQYD2012Z1026.htm
[22]	http://www.cnki.com.cn/Article/CJFDTOTAL-ZQYD2012Z1027.htm
[23]	http://www.cnki.com.cn/Article/CJFDTOTAL-DZDQ200202004.htm
[24]	http://www.cnki.com.cn/Article/CJFDTOTAL-DGYK902.009.htm
[25]	http://www.cnki.com.cn/Article/CJFDTOTAL-KYDH603.012.htm
[26]	http://www.cnki.com.cn/Article/CJFDTOTAL-DGYK1998S1004.htm
[27]	http://www.cnki.com.cn/Article/CJFDTOTAL-DZKT201401017.htm
[28]	http://www.cnki.com.cn/Article/CJFDTOTAL-DIZI201305023.htm
[29]	http://www.cnki.com.cn/Article/CJFDTOTAL-DZKT201303012.htm
[30]	http://www.cnki.com.cn/Article/CJFDTOTAL-HNKC201202009.htm
[31]	http://www.cnki.com.cn/Article/CJFDTOTAL-XBDI201501012.htm
[32]	http://www.cnki.com.cn/Article/CJFDTOTAL-WTYH200904008.htm
[33]	http://www.cnki.com.cn/Article/CJFDTOTAL-DZKT201001014.htm
[34]	http://www.cnki.com.cn/Article/CJFDTOTAL-DQXB201303012.htm
[35]	http://www.cnki.com.cn/Article/CJFDTOTAL-HDDZ200101002.htm
[36]	doi: 10.1134/S001670290602008X
[37]	doi: 10.2113/gsecongeo.97.3.499
[38]	doi: 10.1007/s00126-003-0390-z
[39]