Mineral chemistry characteristics of garnets in diamondiferous basite of Lan'gan area, Anhui Province

CAI Yitao; ZHANG Jie; KANG Congxuan; YANG Xianzhong; CAO Zhengqi; DONG Zhongdou; MA Yuguang; SHI Jianbin

2019 Vol. 38, No. 1

Article Contents

Article navigation > Geological Bulletin of China > 2019 > 38(1): 110-120

Next Article Previous Article

CAI Yitao, ZHANG Jie, KANG Congxuan, YANG Xianzhong, CAO Zhengqi, DONG Zhongdou, MA Yuguang, SHI Jianbin. Mineral chemistry characteristics of garnets in diamondiferous basite of Lan'gan area, Anhui Province[J]. Geological Bulletin of China, 2019, 38(1): 110-120.

Citation:

CAI Yitao, ZHANG Jie, KANG Congxuan, YANG Xianzhong, CAO Zhengqi, DONG Zhongdou, MA Yuguang, SHI Jianbin. Mineral chemistry characteristics of garnets in diamondiferous basite of Lan'gan area, Anhui Province[J]. Geological Bulletin of China, 2019, 38(1): 110-120.

Mineral chemistry characteristics of garnets in diamondiferous basite of Lan'gan area, Anhui Province

1.
Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China
2.
Hubei Institute of Geological Survey, Wuhan 430034, Hubei, China
3.
The Second Institute of Hydrology and Engineering Geological Prospecting, Anhui Geological Prospecting Bureau, Wuhu 241000, Anhui, China
4.
No.5 Geological Party, Jiangsu Bureau of Geology and Mineral Resources, Xuzhou 221004, Jiangsu, China

More Information

Corresponding author: ZHANG Jie, 3976618@qq.com

Received Date: 10 May 2018

Revised Date: 15 June 2018

Publish Date: 15 January 2019

Abstract

Abstract

The mafic rock is exposed in northern Anhui Province, and some of them are diamondiferous rocks. In order to determine the type of garnets, the authors systematically sampled the garnets in diamondiferous basite in Lan'gan area. The MgO, SiO 2, FeO, TiO₂, Al₂O₃, Cr₂O₃, CaO, MnO values of 62 single crystal garnets in this area were measured by electron microprobe spectrometer. The results show that the chemical formula of garnet group minerals is A₃²⁺B₂³⁺(SiO₄)₃. Group A cations are composed of Mg²⁺, Fe²⁺ and Ca²⁺. Group B cations are composed of Al³⁺, Fe³⁺, Mn³⁺ and Cr³⁺. The trivalent cation is mainly Al³⁺ while divalent cation is mainly Ca²⁺. It is inferred that grossularite-andradite-almandine group is the primary class in the Lan'gan area. The high calcium silicate iron garnet (majorite) was found in 62 samples. According to the composition of these majorities in Lan'gan area, the garnet of the diamondiferous basite has formation pressure of 12.1~12.8GPa, and the depth is up to 300km.
- garnet /
- majorite /
- diamondiferous rocks /
- Lan'gan area

FullText(HTML)

References

[1]	庄继翔.宿州市栏杆-褚栏地区金刚石勘查中磁异常特征研究与找矿[J].安徽地质, 2013, 23(2):123-125. doi: 10.3969/j.issn.1005-6157.2013.02.010 CrossRef Google Scholar
[2]	黄先觉.金刚石原生矿床类型及安徽省金刚石找矿前景分析[J].安徽地质, 2012, 22(2):103-105. Google Scholar
[3]	蔡逸涛, 陈国光, 张洁, 等.安徽栏杆地区橄榄辉长岩地球化学特征及其与金刚石成矿的关系[J].资源调查与环境, 2014, 35(4):245-253. doi: 10.3969/j.issn.1671-4814.2014.04.002 CrossRef Google Scholar
[4]	蔡逸涛, 张洁.安徽栏杆含金刚石母岩岩石学研究[J].矿床地质, 2014, 33(supp.):363-365. Google Scholar
[5]	张岳桥, 董树文.郯庐断裂带中生代构造演化史:进展与新认识[J].地质通报, 2008, 27(9):1371-1390. doi: 10.3969/j.issn.1671-2552.2008.09.002 CrossRef Google Scholar
[6]	侯明金, 王永敏, Mercier J, 等.郯庐断裂带(安徽部分)动力学演化及其构造意义[J].地质通报, 2003, 22(2):36-43. Google Scholar
[7]	姚仲伯.安徽省区域地质概要[J].中国区域地质, 1986, (4):309-312. Google Scholar
[8]	张洁, 蔡逸涛, 董钟斗, 等.安徽栏杆金刚石矿物特征及其寄主母岩地球化学特征研究[J].宝石和宝石学杂志, 2015, 17(5):1-11. doi: 10.3969/j.issn.1008-214X.2015.05.001 CrossRef Google Scholar
[9]	蔡逸涛, 杨献忠, 康丛轩.国内外金刚石成因认识现状[J].华东地质, 2017, 38(Supp.):95-102. Google Scholar
[10]	Dawson J B, Stephens W E. Statistical Classification of Garnets from Kimberlite and Associated Xenoliths[J]. The Journal of Geology, 1975, 83(5):589-607. doi: 10.1086/628143 CrossRef Google Scholar
[11]	Jamtvert B, Ragnarsdottir K, Wood B. On the origin of zoned grossular-andradite garnets in hydrothermal systems[J]. European Journal of Mineralogy, 1995, 7(6):1399-1410. doi: 10.1127/ejm/7/6/1399 CrossRef Google Scholar
[12]	Jamtvert B, Wogelius R, Fraser D. Zonation patterns of skarn garnets-records of hydrothermal system evolution[J]. Geology, 1993, 21(2):113-116. doi: 10.1130/0091-7613(1993)021<0113:ZPOSGR>2.3.CO;2 CrossRef Google Scholar
[13]	张安棣, 谢锡林, 郭立鹤.金刚石找矿指示矿物研究及数据库[M].北京:科学技术出版社, 1991. Google Scholar
[14]	Akaogi M, Akimoto S. Pyroxene-garnet solid-solution equilibria in the systems Mg₄Si₄O₁₂-Mg₃Al₂Si₃O₁₂ and Fe₄Si₄O₁₂-Fe₃Al₂Si₃O₁₂ at high pressures and temperatures[J]. Physics of the Earth and Planetary Interiors, 1977, 15(1):90-106. doi: 10.1016/0031-9201(77)90013-9 CrossRef Google Scholar
[15]	Smith J V, Mason B. Pyroxene-Garnet Transformation in Coorara Meteorite[J]. Science, 1970, 168(3933):832-833. doi: 10.1126/science.168.3933.832 CrossRef Google Scholar
[16]	Tappert R, Stachel T, Harris J W, et al. Subducting oceanic crust:The source of deep diamonds[J]. Geology, 2005, 33(7):565-568. doi: 10.1130/G21637.1 CrossRef Google Scholar
[17]	Ringwood A E, Major A, Ringwood A E, et al. High pressure transformations in pyroxenes[J]. Earth Planet Science Letters, 1966, 1:351. doi: 10.1016/0012-821X(66)90023-9 CrossRef Google Scholar
[18]	Ringwood A E, Major A. Synthesis of majorite and other high pressure garnet and perovskites[J]. Earth Planet Science Letters, 1971, 12:411-418. doi: 10.1016/0012-821X(71)90026-4 CrossRef Google Scholar
[19]	Ben H, Cayzer N. Decompression and unmixing of crystals included in diamonds from the mantle transition zone[J]. Physics and Chemistry of Minerals, 2007, 34(9):647-656. doi: 10.1007/s00269-007-0178-2 CrossRef Google Scholar
[20]	Tappert R, Foden J, Stachel T, et al. Deep mantle diamonds from South Australia:A record of Pacific subduction at the Gondwanan margin[J]. Geology, 2009, 37(1):43-46. doi: 10.1130/G25055A.1 CrossRef Google Scholar
[21]	Tappert R, Stachel T, Harris J W, et al. Mineral inclusions in diamonds from the Panda kimberlite, Slave Province, Canada[J]. European Journal of Mineralogy, 2005, 17(3):423-440. doi: 10.1127/0935-1221/2005/0017-0423 CrossRef Google Scholar
[22]	Stachel T, Brey G P, Harris J W. Inclusions in sublithospheric diamonds:glimpses of deep Earth[J]. Elements, 2005, 1(2):73-78. doi: 10.2113/gselements.1.2.73 CrossRef Google Scholar
[23]	Roermund V, Herman L, Drury M R. Ultra-high pressure (P > 6 GPa) garnet peridotites in Western Norway:exhumation of mantle rocks from > 185 km depth[J]. Terra Nova, 1998, 10:295-301. doi: 10.1046/j.1365-3121.1998.00213.x CrossRef Google Scholar
[24]	Scambelluri M, Pettke T, Van Roermund H L M. Majoritic garnets monitor deep subduction fluid flow and mantle dynamics[J]. Geology, 2008, 36(01):59-62. doi: 10.1130/G24056A.1 CrossRef Google Scholar
[25]	Collerson K D, Hapugoda S, Kamber B S, et al. Rocks from the Mantle Transition Zone:Majorite-Bearing Xenoliths from Malaita, Southwest Pacific[J]. Science, 2000, 288(5469):1215-1223. doi: 10.1126/science.288.5469.1215 CrossRef Google Scholar
[26]	Neal C R, Haggerty S E, Sautter V. "Majorite" and "silicate perovskite" mineral compositions in xenoliths from Malaita[J]. Science, 2001, 292(5519):1015. doi: 10.1126/science.292.5519.1015a CrossRef Google Scholar
[27]	Ye K, Cong B, Ye D. The possible subduction of continental material to depths greater than 200km[J]. Nature, 2000, 407:734-736. doi: 10.1038/35037566 CrossRef Google Scholar
[28]	Song S, Zhang L, Niu Y. Ultra-deep origin of garnet peridotite from the North Qaidam ultrahigh-pressure belt, Northern Tibetan Plateau, NW China[J]. American Mineralogist, 2015, 89(8/9):1330-1336. Google Scholar
[29]	刘良, 陈丹玲, 张安达.阿尔金超高压(>7GPa)片麻状(含)钾长石榴辉石岩——石榴子石出溶单斜辉石的证据[J].中国科学(D辑), 2005, 35(02):105-114. Google Scholar
[30]	牛贺才, 张海祥, 单强, 等.扎河坝石榴辉石岩中超硅-超钛石榴子石的发现及其地质意义[J].科学通报, 2007, (18):2169-2174. doi: 10.3321/j.issn:0023-074x.2007.18.012 CrossRef Google Scholar
[31]	陆琦, 刘惠芳, 肖平, 等.中国辽宁金刚石中高硅钙铁榴石(Majorite)等超高压矿物包裹体的发现及地质意义[J].地质科技情报, 2012, 31(5):1-7. Google Scholar
[32]	Van Roermund H L M, Drury M R, Barnhoorn A, et al. Supersilicic garnet microstructures from an orogenic garnet peridotite, evidence for an ultra-deep (>6GPa) origin[J]. Journal of Metamorphic Geology, 2000, 18(2):135-147. doi: 10.1046/j.1525-1314.2000.00251.x CrossRef Google Scholar
[33]	Joswig W, Stachel T, Harris J W, et al. New Ca-silicate inclusions in diamonds-tracers from the lower mantle[J]. Earth and Planetary Science Letters, 1999, 173:1-6. doi: 10.1016/S0012-821X(99)00210-1 CrossRef Google Scholar
[34]	Brenker F E, Vincze L, Vekemans B, et al. Detection of a Ca-rich lithology in the Earth's deep (>300km) convecting mantle[J]. Earth and Planetary Science Letters, 2005, 236:579-587. doi: 10.1016/j.epsl.2005.05.021 CrossRef Google Scholar