Zircon U-Pb ages, geochemical features and geological implications of Middle Devonian granite in Wulanbaixing area, Qimantag area of East Kunlun Mountains

WANG Panxi; GUO Feng; WANG Zhenning

2020 Vol. 39, No. 2-3

Article Contents

Article navigation > Geological Bulletin of China > 2020 > 39(2-3): 194-205

Next Article Previous Article

WANG Panxi, GUO Feng, WANG Zhenning. Zircon U-Pb ages, geochemical features and geological implications of Middle Devonian granite in Wulanbaixing area, Qimantag area of East Kunlun Mountains[J]. Geological Bulletin of China, 2020, 39(2-3): 194-205.

Citation:

WANG Panxi, GUO Feng, WANG Zhenning. Zircon U-Pb ages, geochemical features and geological implications of Middle Devonian granite in Wulanbaixing area, Qimantag area of East Kunlun Mountains[J]. Geological Bulletin of China, 2020, 39(2-3): 194-205.

Zircon U-Pb ages, geochemical features and geological implications of Middle Devonian granite in Wulanbaixing area, Qimantag area of East Kunlun Mountains

1.
Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, CAGS, Zhengzhou 450006, Henan, China
2.
National Research Center of Multipurpose Utilization of Non-metallic Mineral Resources, Zhengzhou 450006, Henan, China
3.
Northwest China Center for Geoscience Innovation, Xi'an 710054, Shaanxi, China

Received Date: 09 November 2018

Revised Date: 15 January 2019

Publish Date: 15 March 2020

Abstract

Abstract

The granite in the study area is composed of monzogranite and granodiorite.Its silicon values are 67.47%~73.63%, alkali values are 6.74%~7.89%, K₂O/Na₂O values are 0.59~1.30, and A/CNK values are 0.91~1.08, suggesting that the rocks belong to metaluminous to peraluminous rocks of high-K cala-alkaline series and cala-alkaline series.The average values of ∑REE is 137.28×10^-6; δEu values vary in the range of 0.37~0.89, with average values of 0.57; (La/Yb)_N values vary in the range of 6.72~19.36, with an average value of 10.75.The chondrite-normalized REE patterns of rocks show the right deviation type with obvious negative Eu anomaly.The rocks are significantly enriched in large ion lithophile elements Rb, K and incompatible elements of U and Th as well as LREE and Pb, relatively depleted in high field strength elements Nb, Ta, P, Ti and large ion lithophile element Ba.The Rb/Sr ratios vary in the range of 0.45~1.17, with average value of 0.72, suggesting the upper mantle and the crust.The Nb/Ta ratios vary in the range of 5.36~13.90, with an average value of 10.93, which are overall lower than the average value of the mantle, and exhibit the characteristics of crust-mantle mixture.Using zircon U-Pb dating, the authors obtained the ²⁰⁶Pb/²³⁸U age 384.1±2.4Ma (MSWD) of Wulanbaixing granodiorite, which represents the formation age of the rock.In combination with geochemical and structural features and regional geological setting, the authors hold that the intrusive body was formed in an extension environment during post-collisional development stage in the Late Middle Devonian continent and was closely related to the mineralization of the iron-polymetallic deposit.Attentions should be paid to these phenomena in the further mineral exploration.
- granite /
- zircon U-Pb ages /
- geochemical features /
- Qimantag

FullText(HTML)

References

[1]	李侃, 高永宝, 钱兵, 等.东昆仑祁漫塔格虎头崖铅锌多金属矿区花岗岩年代学、地球化学及Hf同位素特征[J].中国地质, 2015, 42(3):630-645. Google Scholar
[2]	王松, 丰成友, 李世金, 等.青海祁漫塔格卡尔却卡铜多金属矿区花岗闪长岩锆石SHRIMP U-Pb测年及其地质意义[J].中国地质, 2009, 36(1):74-84. Google Scholar
[3]	丰成友, 王雪萍, 舒晓峰, 等.青海祁漫塔格虎头崖铅锌多金属矿区年代学研究及地质意义[J].吉林大学学报, 2011, 41(6):1806-1817. Google Scholar
[4]	高永宝, 李文渊, 钱兵, 等.东昆仑野马泉铁矿相关花岗质岩体年代学、地球化学及Hf同位素特征[J].岩石学报, 2014, 30(6):1647-1665. Google Scholar
[5]	赵一鸣, 丰成友, 李大新, 等.青华力西部祁漫塔格地区主要矽卡岩铁多金属矿床成矿地质背景和矿化蚀变特征[J].矿床地质, 2013, 32(1):1-19. Google Scholar
[6]	高永宝, 李文渊, 马晓光, 等.东昆仑尕林格铁矿床成因年代学及Hf同位素制约[J].兰州大学学报(自然科学版), 2012, 48(2):36-47. Google Scholar
[7]	姚磊, 吕志成, 赵财胜, 等.青海祁漫塔格地区牛苦头矿床和卡而却卡矿床B区花岗质岩石LA-ICP-MS锆石U-Pb年龄——对泥盆纪成岩成矿作用的指示[J].地质通报, 2016, 35(7):1158-1168. Google Scholar
[8]	赵洪菊, 陈静, 王秉璋, 等.祁漫塔格东段晚三叠世-早侏罗世花岗岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报, 2017, 36(6):1001-1009. Google Scholar
[9]	郭通珍, 刘荣, 陈发彬, 等.青海乌兰乌珠尔斑状正长花岗岩LA-MC-ICPMS锆石U-Pb定年及其地质意义[J].地质通报, 2011, 30(8):1203-1211. Google Scholar
[10]	GB/T 14506, 硅酸盐岩石化学分析方法[M].北京:科学出版社, 2010. Google Scholar
[11]	尹明, 李家熙, 等.岩石矿物分析第四版[M].北京:地质出版社, 2011. Google Scholar
[12]	Li X H, Tang G Q, Gong B, et al.Qinghu zircon:A working reference for microbeam analysis of U-Pb age and Hf and O isotopes[J].Chinese Science Bulletin, 2013, 58(36):4647-4654. Google Scholar
[13]	Middlemost EAK. Naming materials in the magma/igneous rock system[J]. Earth Science Reviews, 1994, 37(34):215-224. Google Scholar
[14]	Maniar P D, Piccoli P M. Tectonic discrimination of granitoids[J].Geol. Soc. Am. Bull., 1989, 101(5):635-643. Google Scholar
[15]	peccerillo A, Taylor S R. Geochemistry of Eocene calc-alkaline volcanicrocks from the kastamonuarea, Northern Turkey[J].Contributions to Mineralogy and Petrology, 1976, 58(1):63-81. Google Scholar
[16]	Middlemost E A K. Magmas and Magmatic Rocks[M].London:Longman, 1985:1-266. Google Scholar
[17]	Sun S S, McDonough W F. Chemical and isotopic systematics of oceanic basalt: implications for mantle composition and process[C]//Saunders A D, Norry M J. Magmatism in the ocean basins.GeologicalSociety, London, Special Publication, 1989, 42(1): 313-345. Google Scholar
[18]	吴元保, 郑永飞.锆石成因矿物学研究及其对U-Pb年龄解释的制约[J].科学通报, 2004, 49(16):1589-1604. Google Scholar
[19]	Mckenzie D P. Some remarks on the movement of small melt fractions in the mantle[J]. Earth and Planetary Science Letters, 1989, 95:53-72. Google Scholar
[20]	Taylor S R, McLennan S M. The geochemical evolution of the continental crust[J]. Reviews of Geophysics, 1995, 33(2):241-165. Google Scholar
[21]	Rudnick L R, Fountain M D. Nature and composition of the continental crust:A lower crustal perspective[J]. Reviews of Geophysics, 1995, 33:267-309. Google Scholar
[22]	肖庆辉, 邓晋福, 马大铨, 等.花岗岩研究思维与方法[M].北京:地质出版社, 2002:1-294. Google Scholar
[23]	丰成友, 王松, 李国臣, 等.青海祁漫塔格中晚三叠世花岗岩:年代学、地球化学及成矿意义[J].岩石学报, 2012, 28(2):665-678. Google Scholar
[24]	Pearce J A, Harris N B W, Tindle A G. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J]. Journal of Petrology, 1984, 25:956-983. Google Scholar
[25]	祁生胜, 邓晋福, 叶占福, 等.青海祁漫塔格地区晚泥盆世辉绿岩墙群LA-ICP-MS锆石U-Pb年龄及其构造意义[J].地质通报, 2013, 32(9):1385-1393. Google Scholar
[26]	陈静, 谢智勇, 李彬, 等.东昆仑拉陵灶火地区泥盆纪侵入岩成因及其地质意义[J].矿物岩石, 2013, 33(6):26-33. Google Scholar
[27]	王冠, 孙丰月, 李碧乐, 等.东昆仑夏日哈木矿区早泥盆世正长花岗岩锆石U-Pb年代学、地球化学及其动力学意义[J].大地构造与成矿学, 2013, 37(4):685-697. Google Scholar
[28]	李世金, 孙丰月, 高永旺, 等.小岩体成大矿理论指导与实践-青海东昆仑夏日哈木铜镍矿找矿突破的启示及意义[J].西北地质, 2012, 45(4):185-191. Google Scholar
[29]	奥琮, 孙丰月, 李碧乐, 等.青海夏日哈木矿区中泥盆世闪长玢岩锆石U-Pb年代学、地球化学及其地质意义[J].西北地质, 2014, 47(1):96-106. Google Scholar
[30]	许庆林.青海东昆仑造山带斑岩型矿床成矿作用研究[D].吉林大学博士学位论文, 2014.http://cdmd.cnki.com.cn/Article/CDMD-10183-1014267862.htm Google Scholar
[31]	刘栋梁, 李海兵, 孙知明, 等.青藏高原祁漫塔格古生代以来主要岩浆活动及其意义[J], 地质通报, 2016, 35(12):2014-2026. Google Scholar
①	刘永成, 曹世泰, 马永胜, 等.青海省东昆仑祁漫塔格地区铜多金属地质矿产调查报告.青海省第四地质矿产勘查院, 2012. Google Scholar