[1]羅春林,劉高峰,左祖發.贛南坪市花崗巖體LA-ICP-MS鋯石U-Pb年齡、地球化學特征及構造意義[J].華東地質,2016,37(02):79-88.[doi:10.16788/j.hddz.32-1865/P.2016.02.001]
 LUO Chun-lin,LIU Gao-feng,ZUO Zu-fa.LA-ICP-MS zircon U-Pb ages and geochemical characteristics of the Pingshi granitic pluton in southern Jiangxi and their tectonic significance[J].East China Geology,2016,37(02):79-88.[doi:10.16788/j.hddz.32-1865/P.2016.02.001]
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贛南坪市花崗巖體LA-ICP-MS鋯石U-Pb年齡、地球化學特征及構造意義
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《華東地質》[ISSN:2096-1871/CN:32-1865/P]

卷:
37
期數:
2016年02期
頁碼:
79-88
欄目:
基礎地質
出版日期:
2016-06-15

文章信息/Info

Title:
LA-ICP-MS zircon U-Pb ages and geochemical characteristics of the Pingshi granitic pluton in southern Jiangxi and their tectonic significance
文章編號:
2096-1871(2016)02-079-10
作者:
羅春林劉高峰左祖發
江西省地質調查研究院,南昌 330030
Author(s):
LUO Chun-lin LIU Gao-feng ZUO Zu-fa
(Geological Survey of Jiangxi Province,Nanchang 330030, China)
關鍵詞:
地球化學 鋯石U-Pb定年 S型花崗巖 坪市花崗巖體 加里東運動 華南陸內造山 贛南
Keywords:
geochemistry zircon U-Pb dating S-type granite Pingshi granitic pluton Caledonian movement intracontinental orogeny in South China SouthernJiangxi
分類號:
P588.12
DOI:
10.16788/j.hddz.32-1865/P.2016.02.001
文獻標志碼:
A
摘要:
本文對贛南橫市地區坪市花崗巖體進行LA-ICP-MS鋯石U-Pb定年、巖石學和地球化學研究。結果表明:鋯石U-Pb年齡分別為456.1±3.8 Ma和441.3±5.2 Ma,表明坪市花崗巖體形成于晚奧陶世—早志留世。地球化學特征顯示,坪市花崗巖體的鋁飽和指數為1.1~1.29,K2O/Na2O為0.97~1.51,屬強過鋁質及高鉀鈣堿性巖石; 稀土元素總量為(113~250)×10-6,輕稀土元素富集,稀土配分模式呈明顯的右傾型; δEu為0.38~0.67,Eu虧損中等偏高; 巖體Rb、Th+U、La+Ce、Nd、Zr+Hf+Sm相對富集,Ba、Nb、Sr、Ti相對虧損。巖體Rb/Sr為0.60~2.82,平均1.66,明顯高于大陸地殼平均值和上地殼平均值,具殼源花崗巖特征。坪市花崗巖體形成于早古生代晚期的加里東構造運動,是華夏古陸塊與揚子古陸塊在新元古代碰撞拼貼之后發生裂解,在中奧陶世至志留紀上地殼部分熔融形成的S型花崗質巖漿,在碰撞至后碰撞過渡期上升至地殼淺部形成的花崗巖體。
Abstract:
This study conducted analysis on the Pingshi granitic pluton in the Hengshiarea, southern Jiangxi Province using LA-ICP-MS zircon U-Pb dating, petrologicaland geochemical methods. The results show that the zircon U-Pb ages of thebiotite monzogranite in the studied areas are 456.1±3.8 Ma and 441.3±5.2 Ma, indicating the Pingshi granitic pluton formed in Late Ordovician to Early Silurian. Geochemical result shows that the Pingshi granitic pluton has ACNK of 1.1~1.29 and K2O/Na2O of 0.97~1.51, suggesting that they belong to peraluminous and high-K calc-alkaline rock. The pluton has a total REE content of(113~250)×10-6, and is enriched in LREE, with distinct right oblique REE patterns, Eu valuesof 0.38 to 0.67 and obvious negative Eu anomaly. The REE analysis shows the pluton is enriched in Rb, Th+U, La+Ce, Nd and Zr+Hf+Sm, and depleted in Ba, Nb, Srand Ti, with Rb/Sr ratio of 0.60~2.82(averaging 1.66)obviously higher than the average values of continental crust and the upper crust, suggesting that the pluton is of the characteristics of crust derived granite. The Pingshi granite pluton might result from the Caledonian movement of late Early Paleozoic, and broke up after collision matching between Cathaysian block and Yangtze block. S-typegranitic magmas, formed by partial melting of the upper crust in the period ofMiddle Ordovician to Silurian, ascended to the shallow part of the crust and yielded the Pingshi granite pluton in the period of collision to post-collision.

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備注/Memo

備注/Memo:
基金項目:中國地質調查局地質調查項目“江西1:50000遂川縣(G50E011003)、良口(G50E011004)、橫市井(G50E012003)、夏府(G50E012004)幅區調”(項目編碼:1212011120812)。
第一作者簡介:羅春林,1967年生,男,高級工程師,主要從事巖石學、區域地質礦產調查及研究工作。
更新日期/Last Update: 2016-06-17
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