Formation Age and Geochemical Characteristics of Supahe Granite Pluton in Longling Area, Yunnan Province: Magmatic Response to Pan-African Movement
-
摘要: 泛非期中酸性岩浆事件影响的时间和空间是国内外地质学家用来确定冈瓦纳范围的重要依据和重要标志之一，也是泛非运动在青藏高原的重要表现形式，发育于云南龙陵地区的苏帕河花岗岩就是其中的酸性岩之一。产于龙陵-瑞丽断裂（简称龙瑞断裂）南东侧的苏帕河花岗岩，其主体岩性为花岗闪长岩、二长花岗岩，岩体除了发育一系列北东向狭窄的片理化带之外，主体为块状构造，少量具有弱片麻状构造。通过6个未变形的花岗岩样品的LA-ICP-MS锆石U-Pb测年，苏帕河花岗岩体侵位时代为527~519Ma，为寒武纪纽芬兰二期的酸性侵入体。通过23个未变形新鲜样品的主微量元素分析测试表明：苏帕河花岗岩体主量元素具有高硅、富碱、富铝的特征，为高钾钙碱性系列过铝质的S型花岗岩；稀土元素总量较高，ΣREE=34.69×10-6~348.20×10-6，轻重稀土分异明显，L/H=2.04~33.31，（La/Yb）N=1.31~67.65，具有强烈的负Eu异常，δEu=0.1~0.9；微量元素富集Rb、Ba、K等大离子亲石元素和Th、Ta、Ce、Hf等高场强元素，明显亏损Sr、Eu、Ti等，主微量元素均显示岩浆经历了分离结晶作用，且发生了斜长石的分异作用。Sr-Nd同位素特征表明，苏帕河花岗岩来源于中晚元古代的地壳部分熔融，并可能存有地幔物质的混入。构造环境判别图解显示出苏帕河花岗岩形成于碰撞构造环境，为泛非运动过程中泛非洲大洋闭合、碰撞的产物。Abstract: Acid magmatic events are the important basis used by geologists to delineate the area of Gondwanal and also an important manifestation of Pan-African movement in qinghai-tibet plateau. The Supahe Granite,southeast side of Longling-Ruili fault (referred to as Longrui fault), developed in Longling Area, Yunnan Province, is one of the acid plutons,mainly composed of granodiorite and monzogranite.The main pluton is of massive structure and weak gneissic structure with a series of NE trending narrow ductile deformation zones.LA-ICP-MS zircon U-Pb dating of 6 undeformed granite samples shows that the emplacement age of Supahe Granite is 527-519 Ma, being an acidic intrusion of the 2nd stage of Cambrian Newfoundland.The major and rare elements from 23 fresh undeformed samples show that Supahe granite is characterized by high silicon, alkali and aluminum.It belongs to S-type peraluminous granite with high-K, calc alkaline series.The total REE content is relatively high, with ΣREE=34.69×10-6~348.20×10-6, and the difference of light and weight rare earth elements is obvious, L/H=2.04~33.31, (La/Yb)N=1.31~67.65. It has the strong negative Eu anomaly with δEu=0.1~0.9. The trace elements are enriched in ion lithophile elements such as Rb, Ba, K and other LILE elements of Th, Ta, Ce, Hf, etc. It is obviously depleted in Sr, Eu, Ti, etc.The composition of major and rare elements shows that the magma has undergone fractional crystallization and differentiation of plagioclase.The isotopic characteristics of 87Sr/86Sr, 143Nd/144Nd indicated that the Supahe granite was originated in the partial melting of the late-Proterozoic crust, with some mantle material mixed in it. The discriminant diagram of tectonic environment showed that the Supahe granite formed in the collision tectonic environment, being the result of the closure and collision of Pan-African ocean in the Pan-African movement.
-
-
王乃文.中国冈瓦纳研究的兴起及与板块构造有关的几个关键古生物地理问题[J].中国地质科学院院报,1984,10:103-114. WANG N W.The Rise of Gondwana Research in China and some Key Problems on Paleoblogeography Related to Plate Tectonics[J].Bulletin of the Chinese Academy of Geological Sciences,1984,10:103-114 (in Chinese with English abstract).
刘本培,冯庆来,Chonglakmani C,等.滇西古特提斯多岛洋的结构及其南北延伸[J].地学前缘,2002,9(3):161-171. LIU B P,FENG Q L,Chonglakmani C,et al. Framework of Paleotethyan Archipelago Ocean of Western Yunnan and its Elongation towards North and South[J].Earth Science Frontiers,2002,9(3):161-171(in Chinese with English abstract).
许志琴,杨经绥,梁风华,等.喜马拉雅的泛非-早古生代造山事件年龄记录[J].岩石学报,2005,12(1):1-12. Xu Z Q,Yang J S,Liang F H,et al.Pan-African and Early Paleozoic orogenic events in the Himalaya terrane:Inference from SHRIMP U-Pb zircon ages[J]. Acta Petrologica Sinica, 2005, 12(01):1-12(in Chinese with English abstract).
许志琴,李海兵,杨经绥.造山的高原-青藏高原巨型造山拼贴和造山类型[J].地学前缘,2006,13(4):1-17. XU Z Q,LI H B,YANG J S.An orogenic plateau-the orogenic collage and orogenic types of the Qinghai-Tibet Plateau[J].Earth Science Frontiers,2006,13(4):1-17.(in Chinese with English abstract).
陈福坤,李秋立,王秀丽,等.滇西地区腾冲地块东侧混合岩锆石年龄和Sr-Nd-Hf同位素组成[J].岩石学报,2006,22(2):439-448. CHEN F K,LI Q L,WANG X L,et al. Zircon age and Sr-Nd-Hf Isotopic Composition of Migmatite in the Eastern Tengchong Block,Western Yunnan[J].Acta Petrologica Sinica,2006,22(2):439-448(in Chinese with English abstract).
王根厚,梁定益,张维杰,等.藏东北构造古地理特征及冈瓦纳北界的时空转换[J].地质通报,2007,26(8):921-928. WANG G H,LIANG D Y,ZHANG W J,et al. Tectono-Paleogeographic Characteristics in Northeastern Tibet,China and Spatial-Temporal Transition of the northern Boundary of Gondwana[J].Geological Bulletin of China,2007,26(8):921-928 (in Chinese with English abstract).
李才,谢尧武,沙绍礼,等.藏东八宿地区泛非期花岗岩锆石SHRIMP U-Pb定年[J].地质通报,2008,27(1):64-68. LI C,XIE Y W,SHA S L,et al. SHRIMP U-Pb Zircon Dating of the Pan-African Granite in Baxoi County,Easter Tibet,China[J].Geological Bulletin of China,2008,27(1):64-68(in Chinese with English abstract).
李才,吴彦旺,王明,等.青藏高原泛非-早古生代造山事件研究重大进展-冈底斯地区寒武系和泛非造山不整合的发现[J].地质通报,2010,29(12):1733-1736. LI C,WU Y W,WANG M,et al. Significant Progress on Pan-African and Early Paleozoic Orogenic Events in Qinghai Tibet Plateau-discovery of Pan-African Orogenic Unconformity and Cambrian System in the Gangdise area,Tibet,China[J].Geological Bulletin of China,2010,29(12):1733-1736 (in Chinese with English abstract).
解超明,李才,苏黎,等.藏北安多地区花岗片麻岩锆石LA-ICP-MS U-Pb定年[J].地质通报,2010,29(12):1737-1744. XIE C M,LI C,SU L,et al. LA-ICP-MS U-Pb Dating of Zircon from Granite-Gnesis in the Amdo Area,Northern Tibet,China[J].Geological Bulletin of China,2010,29(12):1737-1744 (in Chinese with English abstract).
杨启军,徐义刚,黄小龙,等.高黎贡构造带花岗岩的年代学和地球化学及其构造意义[J].岩石学报,2006,22(4):817-834. YANG Q J,XU Y G,HUANG X L,et al. Geochronology and Geochemistry of Granites in the Gaoligong Tectonic Belt,Western Yunnan:Tectonic Implications[J].Acta Petrologica Sinica,2006,22(4):817-834.(in Chinese with English abstract).
杨启军,徐义刚,黄小龙,等.滇西腾冲一梁河地区花岗岩的年代学、地球化学及其构造意义[J].岩石学报,2009,25(5):1092-1104. YANG Q J,XU Y G,HUANG X L,et al. Geochronology and Geochemistry of Granites in the Tengliang Area,Western Yunnan:Tectonic Implication[J].Acta Petrologica Sinica,2009,25(5):1092-1104 (in Chinese with English abstract).
杨启军,徐义刚.滇西怒江-高黎贡构造带内花岗岩的侵位过程及其对特提斯演化过程的响应[J].吉林大学学报(地球科学版),2011,41(5):1353-1361. YANG Q J,XU Y G.The Emplacement of Granites in Nujiang-Gaoligong belt,Western Yunnan,and Response to the Evolvement of Neo-Tethys[J].Journal of Jinlin University(Earth Science Edition),2011,41(5):1353-1361 (in Chinese with English abstract).
黄汲清,陈国铭,陈炳蔚.特提斯-喜马拉雅构造域初步分析[J].地质学报,1984,1:1-17. HUANG J Q,CHEN G M,CHEN B W.Preliminary Analysis of the Tethys-Himalayan Tectonic Domain[J].Acta Geologica Sinica,1984,1:1-17 (in Chinese with English abstract).
吕达鑫,吕红杰.内蒙古阿巴嘎旗二长花岗岩锆石U-Pb年龄确定及其构造意义[J].西北地质,2018,51(2):37-45. LÜ D X, LÜ H J. Zircon U-Pb Age of Monzonite Granite from Abag Banner in Inner Mongolia and Its Tectonic Significance[J]. Northwestern Geology, 2018, 51(2):37-45.
刘军平,孙柏东,崔晓庄,等. 云南安宁地区石虎山花岗岩年代学、地球化学特征和锆石Hf同位素组成及其成因[J]. 中国地质, 2020, 47(3):693-708. LIU Junping,SUN Baidong,CUI Xiaozhuang, et al. Geochronology, geochemistry, zircon Hf isotopic composition and genesis of Shihushan granite in Anning, Yunnan Province[J]. Geology in China, 2020, 47(3):693-708(in Chinese with English abstract).
夏林圻.造山带火山岩浆作用[J].西北地质,2001,34(3):18-28. XIA L Q. Volcano-magmatism of orogenic belts[J]. Northwestern Geology, 2001, 34(3):18-28.
Liu Y S, Hu Z C, Gao S, et al. In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard[J].Contributions to Mineralogy and Petrology,1991,107(2):202-218.
Liu Y S,Gao S, Hu Z C, et al. Continental and oceanic crust recycling-induced melt-peridotie interactions in the Trans-North China Orogen:U -Pb dating, Hf isotopes and trace elements in zircons of mantle xenoliths[J]. Journal of Petrology, 2010, 51:537-571.
Ludwig K R. User's Manual forisoplot 3.00:A Geochronological Toolkit for Microsoft Ecxel[M]. Berkeley:Berkeley Geochronology Center, Special Publication No.4a.2003.
Abdeen M M. Greiling R O.A Quantitative Structural Study of Late Pan-African Compressional Deformation in the Central Eastern Sesert (Egypt) during Gondwana Assembly[J].Gondwana Research,2005,8:457-471.
Sylvester P L. Post-Collisional Strongly Peraluminous Granites[J].Lithos,1998,45(1-4):29-44.
Patino Douce A E. Johnson A D.Phase Equilibria and Melt Productivity in the Politic System:Implication for the Origin of Peraluminous Granitoids and Aluminous Granulates[J].Contributions to Mineralogy and Petrology,1991,107(2):202-218.
Thornton C and Tuttle O. Chemistry of igneous rocks, part1:Differentiation index.America[J]. Journal of Science, 1960, 280:664-684.
-
期刊类型引用(3)
1. 罗培麒 ，付勇 ，唐波 ，姚兰 ，刘国栋 ，潘忠飞 ，龙珍 ，刘阳 . 中国镓矿分布规律、成矿机制及找矿方向. 地球学报. 2023(04): 599-624 . 
百度学术
2. 杨旭，刘志臣，秦先进，肖林，陈磊，李隆富，汪洋. 黔北煤田吴家寨地区晚二叠世煤层地球化学特征及聚煤环境分析. 贵州地质. 2021(03): 299-308 . 百度学术
3. 张文斌，何碧，陶刚，赵飞，王宁祖，杨珍，张志玺，孙平原. 黔北新仁地区上二叠统龙潭组煤质地球化学特征及聚煤规律. 西北地质. 2020(04): 51-65 . 本站查看
其他类型引用(3)
计量
- 文章访问数: 1731
- HTML全文浏览量: 2
- PDF下载量: 1437
- 被引次数: 6
下载:
