Geochronology of Youshan and Pingtian Granites in Nanling Rangeand Its Geological Implication

Abstract

Abstract:

In previous studies, the Youshan granite and Pingtian granite located to the east of the Zhuguangshan composite granite body in Nanling Range were considered being formed in the Yanshanian period. In this study, we present LA-ICP-MS U-Pb zircon dating results which shows that the ages of the Youshan granite and the northwestern part of the Pingtian granite are (213.4±3.0) Ma and (238.8±2.2) Ma, respectively. These results indicate that the Youshan granite was formed by the Indosinian magmatism and the Pingtian granite is probably a composite granite batholith formed in the Indosinian and Yanshanian periods. In addition, it is revealed that both granites contain zircons having inherited cores with ages of Archean and 541 Ma~1 642 Ma, implying existence of Archean crust as well as Proterozoic crust containing rocks formed by several periods of magmatism in the source. Some of the zircons from the Youshan granite display dark rims (in CL images) with Yanshanian ages, which suggests that the granite was probably affected by hydrothermal fluids during the Yanshanian period. Narrow dark rims of zircons are also observed in the Pingtian granite, suggesting effect of hydrothermal fluids.

Key words: LA-ICP-MS zircon U-Pb dating, Youshan granite, Pingtian granite, Nanling, Indosinian

CLC Number:

null

SUN Li-qiang, LING Hong-fei, SHEN Wei-zhou, HUANG Guo-long, TAN Zheng-zhong. Geochronology of Youshan and Pingtian Granites in Nanling Rangeand Its Geological Implication[J]. J4, 2010, 16(2): 186-197.

References

陈培荣，范春芳，孔兴功，等. 2000. 6710铀矿区火成岩的地球化学特征及其构造和成矿意义[J]. 铀矿地质，16(6)：334-343.
陈培荣. 2004. 华南东部中生代岩浆作用的动力学背景及其与铀成矿关系[J]. 铀矿地质，20(5)：266-270.
邓希光，陈志刚，李献华，等.2004. 桂东南地区大容山—十万大山花岗岩带SHRIMP锆石U-Pb定年[J].地质论评，50(4)：426-432.

丁兴，周新民，孙涛. 2005. 华南陆壳基底的幕式生长——来自广东古寨花岗闪长岩中锆石LA-ICP-MS定年的信息[J].地质论评，51(4)：382-392.
范春方，陈培荣. 2000. 赣南陂头花岗岩体Nd-Sr同位素特征及其意义[J]. 地质找矿论丛，15(3)：282-287.
付建明，马昌前，谢才富，等, 2004. 湖南骑田岭岩体东缘菜岭岩体的锆石SHRIMP定年及其意义[J]. 中国地质，31(1)：96-100.
甘晓春，赵风清，金文山，等. 1996. 华南火成岩中捕获锆石的早元古代-太古宙U-Pb年龄信息[J]. 地球化学，25(2)：112-120.
广东省地质矿产局. 1988. 广东省区域地质志[M]. 北京：地质出版社.
华仁民. 2005. 南岭中生代陆壳重熔型花岗岩类成岩-成矿的时间差及其地质意义[J]. 地质论评，51(6)：633-639.
姜耀辉，蒋少涌，凌洪飞. 2004. 地幔流体与铀成矿作用[J]. 地学前缘，11(2)：491-499.
李璞，戴橦谟，邱纯一，等. 1963. 内蒙和南岭地区某些伟晶岩和花岗岩的钾-氩法绝对年龄测定[J]. 地质科学，1：1-9.
李献华. 1990. 万洋山—诸广山花岗岩复式岩基的岩浆活动时代与地壳运动[J]. 中国科学（D辑），7：747-755.
李献华，王一先，赵振华，等. 1998. 闽浙古元古代斜长角闪岩的离子探针锆石U-Pb年代学[J]. 地球化学，27(4)：327-334.
凌洪飞，沈渭洲，邓平，等. 2005. 粤北帽峰花岗岩体地球化学特征及成因研究[J]. 岩石学报，21(3)：677-687.
孙涛，周新民，陈培荣，等.2003. 南岭东段中生代强过铝花岗岩成因及其大地构造意义[J].中国科学（D辑），33(12)：1209-1218.
汪相，陈洁，罗丹. 2008. 浙西南淡竹花岗闪长岩中锆石的成因研究及其地质意义[J]. 地质论评，54(3)：387-398.
王联魁，张玉泉，刘师先. 1975. 南岭诸广山花岗岩体的多次侵入活动和某些地球化学特征[J]. 地球化学，3：189-201.
王强，赵振华，简平，等.2003. 武夷山洋坊霓辉石正长岩的锆石SHRIMP U-Pb年龄及其构造意义[J].科学通报，48(14)：1582-1588.
王岳军，范蔚茗，梁新权，等. 2005. 湖南印支期花岗岩SHRIMP锆石U-Pb年龄及其成因启示[J]. 科学通报，50(12)：1259-1266.
吴元保，郑永飞. 2004. 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，49(16)：1589-1604.
谢才富，朱金初，丁式江，等.2006. 海南尖峰岭花岗岩体的形成时代、成因及其与抱伦金矿的关系[J]. 岩石学报，22(10)：2693-2508.
谢才富，朱金初，丁式江，等. 2006. 琼中海西期钾玄质侵入岩的厘定及其构造意义[J]. 科学通报，51(16)：1944-1954.
,

徐夕生，邓平，OReilly，等. 2003. 华南贵东杂岩体单颗粒锆石激光探针ICPMS U-Pb定年及其成岩意义[J]. 科学通报，48(12)：1328-1334.
于津海，王丽娟，周新民，等. 2006. 粤东北基底变质岩的组成和形成时代[J]. 地球科学——中国地质大学学报，31(1)：38-48.
于津海，魏震洋，王丽娟，等. 2006. 华夏地块：一个有古老物质组成的年轻陆块[J]. 高校地质学报，12(4)：440-447
袁洪林，吴福元，高山，等. 2003. 元素成分分析[J]. 科学通报，48(14)：1511-1520.
张敏，陈培荣，黄国龙，等. 2006. 南岭东段龙源坝复式岩体LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质学报，80(7)：984-994.
张文兰，华仁民，王汝成，等. 2004. 江西大吉山五里亭花岗岩单颗粒锆石U-Pb同位素年龄及其地质意义探讨[J]. 地质学报，78(3)：352-358.
张展适，华仁民，邓平，等. 2007. 337铀矿床帽峰岩体锆石激光探针U-Pb法年龄及其地质意义[J]. 铀矿地质，23(5)：310-315.
赵成峰. 1999. 云南腾冲北部华力西期印支期花岗岩[J]. 中国区域地质，18(3)：260-263.
周新民. 2003. 对华南花岗岩研究的若干思考[J]. 高校地质学报，9(4)：556-565.

[1]	LAN Hongfeng, LING Hongfei*, SUN Liqiang, WANG Kaixing, OUYANG Pingning,LIU Jian. Study on Petrogenesis and Uranium Mineralization Potential of Taojindong Granite in Southern Zhuguangshan Composite Pluton [J]. J4, 2016, 22(1): 12-.
[2]	WANG Xiang. Comment on “Magma-dynamic Evidence for Indosinian Emplacement and Tectonic Implication of the Early Yanshanian Granite Batholiths, South China: Based on Estimates of Emplacement Age for the 8 Granite Batholiths in Nanling Range” [J]. J4, 2014, 20(3): 488-.
[3]	ZHANG Bangtong, WU Junqi, LING Hongfei, CHEN Peirong. Magma-dynamic Evidence for Indosinian Emplacement and Tectonic Implication of the Early Yanshanian Granite Batholiths, South China: Based on Estimates of Emplacement Age for the 8 Granite Batholiths in Nanling Range [J]. J4, 2014, 20(1): 1-.
[4]	YANG Zhen， ZHANG Wenlan， WANG Rucheng， LU Jianjun， XIE Lei， CHE Xudong. Geochronology and geochemical characteristics of metallogenetic pluton in the Youmaling tungsten mining area, northern Guangxi Province, and its geological significance [J]. J4, 2013, 19(1): 159-.
[5]	WANG Ru-Cheng, XIE Lei, CHEN Jun, YU A-Peng, WANG Lu-Bin, LIU Jian-Jun, ZHU Jin-Chu. Titanite as an Indicator Mineral of Tin Mineralizing Potential of Granites in the Middle Nanling Range [J]. J4, 2011, 17(3): 368-.
[6]	ZHUANG Jian-jian,YANG Feng-li, ZHAO Wen-fang. Tectonic Characteristics and Numerical Stress Field Simulation in Indosinian -Early Yanshanian Stage, Lower Yangtze Region [J]. J4, 2010, 16(4): 475-482.
[7]	ZHANG Bang-Tong, WU Jun-Qi, LING Hong-Fei, CHEN Pei-Rong. Magma-Dynamic Evidence for Indosinian Cycle Emplacement of the Qitianling Granite Batholith in Nanling Range, Sourth China: Reply and Discussion to Comments by Prof. Zhu Jinchu et al [J]. J4, 2010, 16(3): 397-412.
[8]	ZHU Jin-chu， WANG Ru-cheng， LU Jian-jun， ZHANG Wen-lan. On the Time Span between Emplacement Age and Zircon U-Pb Age of the Mesozoic Granites in Nanling Range, South China:A Discussion with Prof. Zhang Bangtong et al [J]. J4, 2010, 16(1): 119-123.
[9]	ZHU Jin-chu，CHEN Jun，WANG Ru-cheng，LU Jian-jun，XIE Lei. Early Yanshanian NE Trending Sn/W-Bearing A-Type Granites in the Western-Middle Part of the Nanling Mts Region [J]. J4, 2008, 14(4): 474-484.
[10]	CHEN Jun, LU Jian-Jun, CHEN Wei-Feng, WANG Ru-Cheng, MA Dong-Sheng,ZHU Jin-chu, ZHANG Wen-lan and JI Jun-Feng. W-Sn-Nb-Ta-Bearing Granites in the Nanling Range and Their Relationship to Metallogengesis [J]. J4, 2008, 14(4): 459-473.
[11]	WANG Ru-cheng, ZHU Jin-chu, ZHANG Wen-lan, XIE Lei, YU A-peng, CHE Xu-dong. Ore-Forming Mineralogy of W-Sn Granites in the Nanling Range:Concept and Case Study [J]. J4, 2008, 14(4): 485-495.
[12]	HUA Ren-min, ZHANG Wen-lan, LI Guang-lai, HU Dong-quan, WANG Xu-dong. A Preliminary Study on the Features and Geologic Implication of the Accompanying Metals in Tungsten Deposits in the Nanling Region [J]. J4, 2008, 14(4): 527-538.
[13]	Hua Ren-min, Chen Pei-rong, Zhang Wen-lan, Yao Jun-ming, Lin Jin-fu, Zhang Zhan-shi, Gu Sheng-yan. Metallogeneses and Their Geodynamic Settings Related to Mesozoic Granitoids in the Nanling Range [J]. J4, 2005, 11(3): 291-304.
[14]	HU Jian, QlU Jian-sheng, WANG De-zi, Wang Ru-cheng, ZHANG Xiao-lin. Comparative Investigations of A-type Granites in the Coastal and the Nanling Inland Areas of SE China, and Their Tectonic Significances [J]. J4, 2005, 11(3): 404-414.
[15]	ZHANG Bang-tong, DAI Yong-Shan, WANG Ju, BAI Chou-Yong, LIU Hong-lei. Geology and Magma-Dynamical Features of Jingjiling Composite Granitic Batholith in the Western Nanling Region [J]. J4, 2001, 7(1): 50-61.