华夏地块东南缘南华纪岩浆事件的发现及地质意义
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摘要
通过近几年的地质调查研究工作,在华夏地块东南缘的寻乌—长汀—明溪一线新识别出花岗质片麻岩体及一套变质火山岩组合。同位素测年研究表明,该侵入岩成岩年龄为(722±8.2)Ma～(737.2±4.5)Ma,火山岩年龄为(707±8.6)Ma～(774.8±5.1)Ma,二者同为南华纪岩浆活动的产物。南华纪岩浆岩组合、岩石化学、地球化学的研究表明,该期"S"型花岗岩(γδ-γ)+钙碱性(中)酸火山岩组合,是俯冲带下部地壳重熔的产物;华夏地块南华纪时期具有活动大陆边缘的构造性质,寻乌—长汀—明溪一带南华纪活动陆缘火山弧是发育在中-古元古代陆壳之上靠内陆一侧的内带环境。
Through the geological investigation and research work in recent years, the granitic gneiss and a set of metaphorical volcanic assemblages have been newly identified in the Xunwu-Changting-Mingxi line on the southeast margin of Huaxia block. Isotopic dating shows that the diagenetic age of the intrusive rock is(722 ±8.2) Ma～(737.2 ±4.5) Ma, volcanic rock age is(707 ±8.6) Ma～(774.8 ±5.1) Ma, both of which are the products of Nanhua period magmatic activity. The study of Nanhua period magmatic rock assemblage, petrochemistry and geochemistry shows that the "S" type granite(γδγ) + calc-alkaline(middle) volcanic rock assemblage is the product of crustal remelting in the lower part of the subduction zone. Nanhua period of Huaxia block is the tectonic properties of the active continental margin. The volcanic arc of the Nanhua active continental margin in the Xuwu-Changting-Mingxi area is developed on an inner belt environment on the inland side of the Middle-Old Proterozoic continental crust.
Through the geological investigation and research work in recent years, the granitic gneiss and a set of metaphorical volcanic assemblages have been newly identified in the Xunwu-Changting-Mingxi line on the southeast margin of Huaxia block. Isotopic dating shows that the diagenetic age of the intrusive rock is(722 ±8.2) Ma～(737.2 ±4.5) Ma, volcanic rock age is(707 ±8.6) Ma～(774.8 ±5.1) Ma, both of which are the products of Nanhua period magmatic activity. The study of Nanhua period magmatic rock assemblage, petrochemistry and geochemistry shows that the "S" type granite(γδγ) + calc-alkaline(middle) volcanic rock assemblage is the product of crustal remelting in the lower part of the subduction zone. Nanhua period of Huaxia block is the tectonic properties of the active continental margin. The volcanic arc of the Nanhua active continental margin in the Xuwu-Changting-Mingxi area is developed on an inner belt environment on the inland side of the Middle-Old Proterozoic continental crust.
引文
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29 Li X H..U-Pb zircon ages of granites fron the southern margin of the Yangtze Block:tining of Neoproterozoic Jinning:oroggeny in SE China and implications for Rodinia assembly.Precambrian Res,1999,97.
30 张国伟,郭安林,王岳军,等.中国华南大陆构造与问题.中国科学(D辑) ,2013,43.
31 周金城,王孝磊,邱检生.江南造山带是否格林威尔期造山带?——关于华南前寒武纪地质的几个问题.高校地质,2008,14(1).
32 凌文黎,高山,程建萍,等.扬子陆核与陆缘新元古代岩浆事件对比及其构造意义——来自黄陵和汉南侵入杂岩ELA-ICPMS锆石U-Pb同位素年代学的约束.岩石学报,2006,22(2).
33 王宗培.福建省地壳-上地幔结构及深部构造背景的研究.福建地质,1994,13(2).
2 舒良树.华南前泥盆纪构造演化:从华夏地块到加里东期造山带.高校地质学报,2006,12(4).
3 Wan Y S,Liu D Y,Xu M H,et al.SHRIMP U -Pb zircon geochronology and geochemistry of metavolcanic and metasedimentary rocks in Northwestern Fujian,Cathaysia Block,China:Tectonic implications and the need to redefine lithostratigraphic units.Gondwana Research,2007,12 (1-2) .
4 Yu Jinhai,O'Reilly S Y,Wang Lijuan,et al.Finding of ancient materials in Cathaysia and implication for the formation of Precambrian crust.Chin.Sci.Bull.,2007,52.
5 福建省地质调查研究院.中国区域地质志·福建志.北京:地质出版社,2016.
6 黄家龙.武夷山南段新元古代花岗质片麻岩的发现及其地质特征.福建地质,2016,35(1).
7 福建省地质矿产局.福建省区域地质志.北京:地质出版社,1985.
8 刘欢,朱士兴,田辉,等.燕山地区新元古界龙山组微体化石新材料.世界地质,2017,1.
9 刘欢,孙淑芬,朱士兴.华北燕山地区雾迷山组疑源类化石组合及其特征.地质调查与研究,2015,38(3).
10 尹磊明,薛耀松,袁训来.中国南方末元古宙陡山沱组中的具刺磷酸盐微体化石(英文).微体古生物学报,1999,(3).
11 尹崇玉,高林志.中国早期具刺疑源类的演化及生物地层学意义.地质学报,1995,(4).
12 黄家龙.长汀地区楼前组变质火山岩石组合及形成时代.福建地质,2018,37(1).
13 肖庆辉,邓晋福,马大拴,等.花岗岩研究思维与方法.北京地质出版社,2002.
14 Barbarin B A review of the relationships between granitoid types,their origins and their geodynamic environments Lithos,1999,46.
15 Sylvester,P J.post-collisional strongly peraluminous granites Lithos,1998,45.
16 邓晋福,肖庆辉,苏尚国,等.火成岩组合与构造环境讨论.高校地质学报,2007,13(3).
17 黎彤.化学元素的地球丰度.地球化学,1976,(3).
18 Tayloy S.R and Monster J..The continental crust:its composition and evolution.Oxford:Blackwell,1985.
19 高山.关于大陆地壳化学组成研究中某些问题的讨论.地球科学,1999.24(3) .
20 邱家骧,林景仟.岩石化学.北京:地质出版社.1991.
21 Jakes P.et al..造山区域火山岩的主要元素及微迹元素的丰度.南京大学地质科技资料,1972,(2).
22 赵振华.关于岩石微量元素构造环境差别图解使用的有关问题.大地构造与成矿学,2007,31(1).
23 李昌年.火成岩微量元素岩石学.北京:中国地质大学出版社,1992.
24 Li Z X.,Li X H.,Kinny P D.,et al.Geochronology of Neoproterozoic Syn-rift magmatism in the Yangtze Craton,South China and correlations with other continents:evidence for a mantle superplume that broke up Rodinia.Precambrian Res,2003,122.
25 Li Z X.,Li X H.,Kinny P D.,et al.The breakup of Rodinia:Did it start with a mantle plume beneath South China?Earth Plannet Sci Lett,1999,173.
26 Li Z X.,Li X H.,Powell C M,Wang J..830-820 Ma mafic to felsic igneous activity in South China part of Plume-induced rifting that led to the breakup of Rodinia?J.Conf.Abst.,1999,4.
27 Li Z X.,Zhang L H.,Powell C M..Positions of the East Asian cratons in the Neoproterozoic super-continent Rodinia.Australia Earth Science,1996,43.
28 Li Z X.,Zhang L H.,Powell C M..South China in Rodinia:part of the missing link between Australia-East Antarctic and Laurentia?Geology,1995,23(5).
29 Li X H..U-Pb zircon ages of granites fron the southern margin of the Yangtze Block:tining of Neoproterozoic Jinning:oroggeny in SE China and implications for Rodinia assembly.Precambrian Res,1999,97.
30 张国伟,郭安林,王岳军,等.中国华南大陆构造与问题.中国科学(D辑) ,2013,43.
31 周金城,王孝磊,邱检生.江南造山带是否格林威尔期造山带?——关于华南前寒武纪地质的几个问题.高校地质,2008,14(1).
32 凌文黎,高山,程建萍,等.扬子陆核与陆缘新元古代岩浆事件对比及其构造意义——来自黄陵和汉南侵入杂岩ELA-ICPMS锆石U-Pb同位素年代学的约束.岩石学报,2006,22(2).
33 王宗培.福建省地壳-上地幔结构及深部构造背景的研究.福建地质,1994,13(2).
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