古太平洋岩石圈消减与中国东南部晚中生代火成岩成因——岩石圈消减与玄武岩底侵相结合模式的补充证据
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摘要
本文根据中国东南部 140个晚中生代火成岩 Rb- Sr等时线年龄匹配的 Isr值 ,勾画了 Isr等值线图。该图与 TDM等值线图有好的对应 ,都在浙闽沿海地区、南岭东段和武夷山北段出现低值区或低值带 ,反映中国东南地壳在晚中生代时期 ,有广泛的地幔物质的加入 ,它们以底侵的形式底垫在中 -下地壳。沿海地区 Isr、TDM的低值区、带受地壳厚度的控制 ,内陆的低值区、带可能与局部应力场导致的拉张减薄有关。浙闽沿海晚中生代火成岩岩石地球化学显示大离子亲石元素 Rb、Sr、Ba、Th和 Ce富集 ,高场强元素 Nb、Ta、Zr、Hf和重稀土 Y、Yb亏损 ,具有明显的消减带岩浆作用的特征。西太平洋地震层析成像显示 ,西太平洋板块俯冲是连续的。在大约 2 0 0 0～ 12 0 0 km深度 ,地幔中正在下沉的古俯冲洋壳明显偏西 ,可能反映那时为低角度俯冲。中国东南部广泛发育的NE- NNE褶皱和断裂构造 ,与古太平洋板块向欧亚大陆之下的俯冲作用有关。大规模晚中生代岩浆活动之前的陆相沉积 ( T3- J2 )是造山磨拉石建造。上述地质证据均支持消减作用和底侵作用相结合的模式
Based on 140 Isr values of Late Mesozoic granitoids from southeastern China, the Isr isoline diagram was drawed. The low Isr regions and bands, which are similar to the low TDM regions and bands, appear in the coastal region of Zhejiang and Fujian Provinces, in the northern Wuyi Mountain and the eastern Nanling Mountain, which suggested that extensive mafic magma underplated in the mid lower crust of southeastern China during the Late Mesozoic. The low Isr band occurring in the coastal region of Zhejiang and Fujian Provinces was related to the thickness of crust, and the low Isr regions in the inland were caused by the local pull apart of the continental lithosphere. The geochemical characteristics of Late Mesozoic igneous rocks from the coastal region of Zhejiang and Fujian Provinces enriched large ion lithophile elements (Rb, Sr, Ba, Th) and Ce and depleted high field strength elements (Nb, Ta, Zr, Hf) and heavy rare earth elements (Y, Yb), which were the typical characteristics of subduction zone magmatism. From 2 800 km to surface, the subducted slab is a continuum shown by the seismic tomography map of the western Pacific Ocean. From about 2 000 km to 1 200 km below the surface, the subducted slab shows departure from the normal locus to west, which suggested that the subduction angle was lower in that epoch. The NE-NNE trending folds and faults developed in the extensive region of southeastern China were caused by the paleo Pacific plate subducting under the Eurasia plate with a low dip angle. The Late Triassic to Middle Jurassic terrestrial deposits that predated the generation of numerous Late Mesozoic igneous rocks make up an orogenic molasse formation, suggesting that Indosinian folding and faulting, deposition of the orogenic molasse formation and generation of numerous Late Mesozoic igneous rocks in southeastern China were different stages of a whole orogenic event. All the geological evidences shown above supported the model of lithosphere subduction and mafic magma underplating.
Based on 140 Isr values of Late Mesozoic granitoids from southeastern China, the Isr isoline diagram was drawed. The low Isr regions and bands, which are similar to the low TDM regions and bands, appear in the coastal region of Zhejiang and Fujian Provinces, in the northern Wuyi Mountain and the eastern Nanling Mountain, which suggested that extensive mafic magma underplated in the mid lower crust of southeastern China during the Late Mesozoic. The low Isr band occurring in the coastal region of Zhejiang and Fujian Provinces was related to the thickness of crust, and the low Isr regions in the inland were caused by the local pull apart of the continental lithosphere. The geochemical characteristics of Late Mesozoic igneous rocks from the coastal region of Zhejiang and Fujian Provinces enriched large ion lithophile elements (Rb, Sr, Ba, Th) and Ce and depleted high field strength elements (Nb, Ta, Zr, Hf) and heavy rare earth elements (Y, Yb), which were the typical characteristics of subduction zone magmatism. From 2 800 km to surface, the subducted slab is a continuum shown by the seismic tomography map of the western Pacific Ocean. From about 2 000 km to 1 200 km below the surface, the subducted slab shows departure from the normal locus to west, which suggested that the subduction angle was lower in that epoch. The NE-NNE trending folds and faults developed in the extensive region of southeastern China were caused by the paleo Pacific plate subducting under the Eurasia plate with a low dip angle. The Late Triassic to Middle Jurassic terrestrial deposits that predated the generation of numerous Late Mesozoic igneous rocks make up an orogenic molasse formation, suggesting that Indosinian folding and faulting, deposition of the orogenic molasse formation and generation of numerous Late Mesozoic igneous rocks in southeastern China were different stages of a whole orogenic event. All the geological evidences shown above supported the model of lithosphere subduction and mafic magma underplating.
引文
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1998 陈培荣 .赣南燕山早期双模式火山 -侵入杂岩的构造动力学背景及其成因演化 [D].南京 :南京大学 .
1998 郭福祥 .中国南方中新生代大地构造属性和南华造山带褶皱过程 [J].地质学报 ,72 ( 1) :2 2 - 33.
1999 Van Der Voo R,Spakman W,Bijwaard H.Mesozoic subducted slabs under Siberia [J].Nature,397:2 4 6- 2 4 9.
1999 李武显 ,周新民 .中国东南部晚中生代俯冲带探索 [J].高校地质学报 ,5( 2 ) :164- 169.
2 0 0 0 李武显 ,周新民 .浙闽沿海晚中生代火成岩成因的地球化学制约 [J].自然科学进展 ,10 ( 7) :630 -641.
2 0 0 0 L i X H.Cretaceous magmatism and lithospheric extension in Southeast China [J].Journal of AsianEarth Sciences,18:2 93- 30 5.
2 0 0 0 周新民 ,李武显 .中国东南部晚中生代火成岩成因 :岩石圈消减和玄武岩底侵相结合的模式 [J].自然科学进展 ,10 ( 3) :2 4 0 - 2 4 7.
1982 吴利仁 ,齐进英 ,王听渡 ,张秀棋 ,徐永生 .中国东部中生代火山岩 [J].地质学报 ,56( 3) :2 2 3- 2 34 .
1983 Pearce JA.Role of the sub- continental lithosphere in magma genesis at active continental margins[C].In:Hawkesworth C Jand Norry M J( eds) .Continental basalts and mantle xenoliths,ShivaPublishing House,2 30 - 2 4 9.
1983 崔盛芹 ,李锦蓉 .试论中国滨太平洋带的印支运动 [J].地质学报 ,57( 1) :51- 61.
1983 郭令智 ,施央申 ,马瑞士 .西太平洋中、新生代活动大陆边缘和岛弧构造的形成和演化 [J]. 57( 1) :11- 2 1.
1983 翁世吉力 ,黄海 .中国东南部侏罗 -白垩纪板块构造活动与相关的岩浆活动 [J].地质学报 ,57( 2 ) :119- 12 6.
1986 叶伯丹 ,申永治 ,朱杰辰 .全国同位素地质年龄数据汇编 (第四集 ) [M].北京 :地质出版社 .
1987 Xu J,Zhu G,Tong W X,Gui K R,L iu Q.Formation and evolution of the Tancheng- Lujiang wrenchfault system :a major shear system to the northwest of the Pacific Ocean [J].Tectonophysics,134 :2 73- 310 .
1988 Hildreth W,Moorbath S.Crustal contributions to arc magmatism in the Andes of Central Chile [J].Contributions to Mineralogy and Petrology,98:4 55- 4 89.
1989 李坤英 ,沈加林 ,王小平 .中国浙闽赣地区造山带陆相火山岩同位素年代学 [J].地层学杂志 ,13( 1) :1- 13.
1989 Wilson M.Igneous Petrogenesis[M].L ondon:Unwin Hyman.
1990 Jahn B M,Zhou X H,L i JL.Formation and tectonic evolution of southeastern China and Taiwan:isotopic and geochemical constraints[J].Tectonophysics,183:145- 160 .
1993 Roberts M P,Clemens JD.Origin of high- potassium,calc- alkaline,I- type granitoids[J].Geology,2 1:82 5- 82 8.
1993 侯泉林 ,李继亮 .闽西南前陆褶皱冲断带初步研究 [C].见 :李继亮主编 .东南大陆岩石圈结构与地质演化 .北京 :冶金工业出版社 ,2 7- 33.
1994 周王旬若 ,吴克隆 ,等 .漳州 I- A型花岗岩 [M].北京 :科学出版社 .
1995 陈胜早 .中国及邻域的深部构造及其成矿意义 [J].地质学报 ,69( 1) :1- 14.
1995 Martin H,Bonin B,Capdeivil R,Jahn B M,Lameyre J,Wang Y.The Kuiqi peralkaline granitic com-plex( SE China) :Petrology and geochemistry[J].Journal Petrology,35:983- 10 15.
1995 Tatsumi Y,Eggins S.Subduction zone magmatism[M].Blackwell Sci.,Inc.
1996 谢家莹 ,陶奎元 ,等 .中国东南大陆中生代火山地质及火山 -侵入杂岩 [M].北京 :地质出版社 .
1996 陈爱根 ,吴正文 .福建宁化湖村盆地构造解析及其地质意义 [J].地质论评 ,4 2 ( 3) :193- 199.
1997 L apierre H,Jahn B M,Charvet J,Yu Y W.Mesozoic felsic arc magmatism and continental olivinetholeiites in Zhejiang Province and their relationship with the tectonic activity in southeastern China[J].Tectonophysics,2 74 :32 1- 338.
1997 毛建仁 ,陶奎元 ,杨祝良 ,朱云鹤 ,薛怀民 .中国东南部中生代陆内岩浆作用的动力学背景 .火山地质与矿产 ,18( 2 ) :95- 10 3.
1997 沈渭洲编 .同位素地质学原理 [M].北京 :原子能出版社 .
1997 肖文交 ,李继亮 ,何海清 ,陈海泓 .浙西北前陆褶皱冲断带初步研究 [J].中国科学 ( D) ,2 7( 1) :2 7-32 .
1998 陈培荣 .赣南燕山早期双模式火山 -侵入杂岩的构造动力学背景及其成因演化 [D].南京 :南京大学 .
1998 郭福祥 .中国南方中新生代大地构造属性和南华造山带褶皱过程 [J].地质学报 ,72 ( 1) :2 2 - 33.
1999 Van Der Voo R,Spakman W,Bijwaard H.Mesozoic subducted slabs under Siberia [J].Nature,397:2 4 6- 2 4 9.
1999 李武显 ,周新民 .中国东南部晚中生代俯冲带探索 [J].高校地质学报 ,5( 2 ) :164- 169.
2 0 0 0 李武显 ,周新民 .浙闽沿海晚中生代火成岩成因的地球化学制约 [J].自然科学进展 ,10 ( 7) :630 -641.
2 0 0 0 L i X H.Cretaceous magmatism and lithospheric extension in Southeast China [J].Journal of AsianEarth Sciences,18:2 93- 30 5.
2 0 0 0 周新民 ,李武显 .中国东南部晚中生代火成岩成因 :岩石圈消减和玄武岩底侵相结合的模式 [J].自然科学进展 ,10 ( 3) :2 4 0 - 2 4 7.
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