赣南晚侏罗世铝质A型花岗岩带及其意义
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摘要
赣南燕山早期岩浆作用强烈,岩石成因以I型花岗岩为主,见少量S型花岗岩及A型花岗岩。在赣南兴国地区新识别了晚侏罗世永丰和隆市A型花岗岩,其LA-ICP-MS锆石U-Pb定年结果分别为155 Ma和157～154 Ma,具有铝质A型花岗岩的地球化学特征,如富硅(70.22%～77.08%)、高(Zr+Nb+Ce+Y)(189×10~(-6)～348×10~(-6))、高FeO~T/MgO值(3.39～11.57);具相对较高Ga/Al值(2.4×10~(-4)～2.9×10~(-4));富集Th、U、Hf等高场强元素和轻稀土元素,强烈亏损Ba、Sr、P、Ti等大离子亲石元素,相对亏损Nb和Ta元素。在赣南厘定出了一条北东向晚侏罗世铝质A型花岗岩带(162～152 Ma),它们具有相似的Hf同位素组成,T_(DM2)大部分集中在2.0～1.8 Ga之间,平均为1.9 Ga,暗示它们可能形成于相似的古老地壳物质的部分熔融。根据地球化学特征,并结合邻近的赣南全南地区存在同时代的"裂谷型"黄埠正长岩,认为赣南晚侏罗世铝质A型花岗岩带形成于板内拉张环境,可能与古太平洋板块俯冲-后退有关。
The early Yanshanian magmatism in southern Jiangxi is intensive, and the petrogenesis is mainly I-type granite, with a small amount of S-type granite and A-type granite. The Late Jurassic Yongfeng complex, composed of the Yongfeng and Longshi plutons in the Xingguo area, is identified as A-type granites in this study. They have LA-ICP-MS zircon U-Pb dating results of 155 Ma and 157-154 Ma, respectively. The rock has the geochemical characteristics of aluminum A-type granites, such as high Si(70.22%-77.08%),(Zr+Nb+Ce+Y)(189×10~(-6)-348×10~(-6)), FeO~T/MgO(3.39-11.57) and Ga/Al ratios(2.4×10~(-4)-2.9×10~(-4)), enriched in high field strength elements such as Th, U, Hf, and depleted in Nb, Ta and large ion lithophile elements such as Ba, Sr, P, and Ti. Combined with the previous achievements, a northeastern Late Jurassic A-type granite belt(162-152 Ma) could be defined in southern Jiangxi, which has similar Hf isotopic composition, with most of T_(DM2) concentrated between 2.0-1.8 Ga, with the average of 1.9 Ga. This suggests that they may be formed by partial melting of similar ancient crustal material. The geochemical characteristics, combined with the contemporaneous "Rift-type" syenite in Quannan area, reveal that the A-type granite belt is formed in the intraplate extensional environment, which may be connected with the Paleo-Pacific plate subduction-roll back.
The early Yanshanian magmatism in southern Jiangxi is intensive, and the petrogenesis is mainly I-type granite, with a small amount of S-type granite and A-type granite. The Late Jurassic Yongfeng complex, composed of the Yongfeng and Longshi plutons in the Xingguo area, is identified as A-type granites in this study. They have LA-ICP-MS zircon U-Pb dating results of 155 Ma and 157-154 Ma, respectively. The rock has the geochemical characteristics of aluminum A-type granites, such as high Si(70.22%-77.08%),(Zr+Nb+Ce+Y)(189×10~(-6)-348×10~(-6)), FeO~T/MgO(3.39-11.57) and Ga/Al ratios(2.4×10~(-4)-2.9×10~(-4)), enriched in high field strength elements such as Th, U, Hf, and depleted in Nb, Ta and large ion lithophile elements such as Ba, Sr, P, and Ti. Combined with the previous achievements, a northeastern Late Jurassic A-type granite belt(162-152 Ma) could be defined in southern Jiangxi, which has similar Hf isotopic composition, with most of T_(DM2) concentrated between 2.0-1.8 Ga, with the average of 1.9 Ga. This suggests that they may be formed by partial melting of similar ancient crustal material. The geochemical characteristics, combined with the contemporaneous "Rift-type" syenite in Quannan area, reveal that the A-type granite belt is formed in the intraplate extensional environment, which may be connected with the Paleo-Pacific plate subduction-roll back.
引文
[1] Zhou X M,Sun T,Shen W Z,et al.Petrogenesis of Mesozoic granitoids and volcanic rocks in South China:A response to tectonic evolution[J].Episodes,2006,29(1):26-33.
[2] Li X H,Li W X,Li Z X.On the genetic classification and tectonic implications of the Early Yanshanian granitoids in the Nanling range,South China[J].Chinese Science Bulletin,2007,52(14):1873-1885.
[3] Li X H,Li Z X,Li W X,et al.U-Pb zircon,geochemical and Sr-Nd-Hf isotopic constraints on age and origin of Jurassic I-and A-type granites from central Guangdong,SE China:A major igneous event in response to foundering of a subducted flat-slab?[J].Lithos,2007,96(1):186-204.
[4] 项媛馨,巫建华.赣南龙南地区余田群玄武岩SHRIMP锆石U-Pb年龄及其地质意义[J].地质通报,2012,31(5):716-725.
[5] He Z Y,Xu X S,Niu Y L.Petrogenesis and tectonic significance of a Mesozoic granite-syenite-gabbro association from inland South China[J].Lithos,2010,119(3):621-641.
[6] Jiang Y H,Wang G C,Liu Z,et al.Repeated slab-advance retreat of the Palaeo-Pacific plate underneath SE China[J].International Geology Review,2015,57:472-491.
[7] Li X H,Chen Z G,Liu D Y,et al.Jurassic gabbro-granite-syenite suites from southern Jiangxi Province,SE China:Age,origin and tectonic significance[J].International Geology Review,2003,45:898-921.
[8] 赵希林,毛建仁,刘凯,等.赣南与钨锡矿化有关的九曲二云母花岗岩的形成时代及其岩石成因初探[J].地质论评,2013,59(1):83-96.
[9] 张文兰,华仁民,王汝成,等.赣南漂塘钨矿花岗岩成岩年龄与成矿年龄的精确测定[J].地质学报,2009,83(5):659-670.
[10] 方贵聪,陈毓川,陈郑辉,等.赣南盘古山钨矿床锆石U-Pb和辉钼矿Re-Os年龄及其意义[J].地球学报,2014,35(1):76-84.
[11] 丰成友,黄凡,曾载淋,等.赣南九龙脑岩体及洪水寨云英岩型钨矿年代学[J].吉林大学学报:地球科学版,2011,41(1):111-121.
[12] 丰成友,曾载淋,屈文俊,等.赣南兴国县张家地钼钨矿床成岩成矿时代及地质意义[J].岩石学报,2015,31(3):709-724.
[13] 李丽侠,陈郑辉,施光海,等.江西岿美山钨矿矿床的成矿年龄及地质特征[J].岩矿测试,2014,33(2):287-295.
[14] 刘善宝,王登红,陈毓川,等.赣南兴国留龙金矿田井头复式岩体锆石SHRIMP U-Pb定年及地质意义[J].矿床地质,2010,29(2):290-300.
[15] 王崴平,陈毓川,王登红,等.赣南兴国县良村花岗岩锆石LA-ICP-MS U-Pb年代学、岩石地球化学与成岩机制研究[J].大地构造与成矿学,2014,38(2):347-358.
[16] 陈志刚,李献华,李武显,等.赣南全南正长岩的SHRIMP锆石U-Pb年龄及其对华南燕山早期构造背景的制约[J].地球化学,2003,32(3):223-229.
[17] Whalen J B,Currie K L,Chappell B W.A-type granites:Geochemical characteristics,discrimination and petrogenesis[J].Contributions to Mineralogy & Petrology,1987,95(4):407-419.
[18] Eby G N.Chemical subdivision of A-type granitoids:Petrogenesis and tectonic implications[J].Geology,1992,20(7):641.
[19] 王德滋,赵广涛,邱检生.中国东南部晚中生代A型花岗岩的构造制约[J].高校地质学报,1995,1(2):13-21.
[20] 吴福元,李献华,郑永飞,等.Lu-Hf同位素体系及其岩石学应用[J].岩石学报,2007,23(2):185-220.
[21] 陈培荣,孔兴功,王银喜,等.赣南燕山早期双峰式火山-侵入杂岩的Rb-Sr同位素定年及意义[J].高校地质学报,1999,1(5):378-382.
[22] 邱检生,王德滋,Mcinnes B I A,等.浙闽沿海地区I型-A型复合花岗岩体的地球化学及成因[J].岩石学报,1999,15(2):237-246.
[23] 范春方,陈培荣.赣南陂头A型花岗岩的地质地球化学特征及其形成的构造环境[J].地球化学,2000,29(4):358-366.
[24] 付建明,马昌前,谢才富,等.湘南西山铝质A型花岗质火山侵入杂岩的地球化学及其形成环境[J].地球科学与环境学报,2004,26(4):15-23.
[25] 胡建,邱检生,王德滋,等.中国东南沿海与南岭内陆A型花岗岩的对比及其构造意义[J].高校地质学报,2005,11(3):404-414.
[26] 张岳桥,徐先兵,贾东,等.华南早中生代从印支期碰撞构造体系向燕山期俯冲构造体系转换的形变记录[J].地学前缘,2009,16(1):234-247.
[27] Chen C H,Lee C Y,Shinjo R.Was there Jurassic paleo-Pacific subduction in South China?Constraints from 40Ar/39Ar dating,elemental and Sr-Nd-Pb isotopic geochemistry of the Mesozoic basalts[J].Lithos,2008,106(1):83-92.
[28] 江西省地质局区域地质调查大队.1∶20万兴国幅区域地质调查报告[R].南昌:江西省地质局区域地质调查大队,1978.
[29] Hu Z C,Zhang W,Liu Y S,et al.“Wave” signal smoothing and mercury removing device for laser ablation quadrupole and multiple collector ICP-MS analysis:Application to lead isotope analysis[J].Analytical Chemistry,2015,87(2):1152-1157.
[30] Liu Y S,Gao S,Hu Z C,et al.Continental and oceanic crust recycling-induced melt-peridotite 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(1/2):537-571.
[31] 吴元保,郑永飞.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,2004,49(16):1589.
[32] Middlemost E K.Naming materials in the magma/igneous rock system[J].Earth-Science Reviews,1994,37(3/4):215-224.
[33] Maniar P D,Piccoli P M.Tectonic discrimination of granitoids[J].Journal of Geological Society of America Bulletin,1989,101(5):635-643.
[34] Sun S S,Mcdonough W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes[J].Geological Society London Special Publications,1989,42(1):313-345.
[35] 刘邦秀,李永明.江西省“九五”期间1∶5万区调工作主要进展[J].江西地质,2001,15(3):225-229.
[36] 江西省地质局赣南地质调查大队.1∶5万兴国县幅地质图说明书[R].江西赣州:江西省地质局赣南地质调查大队,1986.
[37] 舒徐洁,陈志洪,朱延辉,等.赣南兴国东固高分异花岗岩成因及地质意义[J].地质论评,2018,64(1):108-126.
[38] King P L,White A J R,Chappell B W,et al.Characterization and origin of aluminous A-type granites from the Lachlan Fold Belt,Southeastern Australia[J].Journal of Petrology,1997,38(3):371-391.
[39] Watson E B.Zircon saturation revisited:Temperature and composition effects in a variety of crustal magma types[J].Earth and Planetary Science Letters,1983,64(2):295-304.
[40] Collins W J,Beams S D,White A J R,et al.Nature and origin of A-type granites with particular reference to southeastern Australia[J].Contributions to Mineralogy & Petrology,1982,80(2):189-200.
[41] Defant M J,Drummond M S.Derivation of some modern arc magmas by melting of young subducted lithosphere [J].Nature,1990,347:662-665.
[42] Guo N X,Zhao Z,Gao J F,et al.Magmatic evolution and W-Sn-U-Nb-Ta mineralization of the Mesozoic Jiulongnao granitic complex,Nanling Range,South China[J].Ore Geology Reviews,2018,94(3):414-434.
[43] 徐先兵,张岳桥,贾东,等.华南早中生代大地构造过程[J].中国地质,2009,36(3):573-593.
[44] 黄子进,付建明,路远发,等.南岭地区五团岩体锆石LA-ICP-MSU-Pb定年、地球化学特征及其地质构造意义[J].地质科技情报,2017,36(6):83-93.
[2] Li X H,Li W X,Li Z X.On the genetic classification and tectonic implications of the Early Yanshanian granitoids in the Nanling range,South China[J].Chinese Science Bulletin,2007,52(14):1873-1885.
[3] Li X H,Li Z X,Li W X,et al.U-Pb zircon,geochemical and Sr-Nd-Hf isotopic constraints on age and origin of Jurassic I-and A-type granites from central Guangdong,SE China:A major igneous event in response to foundering of a subducted flat-slab?[J].Lithos,2007,96(1):186-204.
[4] 项媛馨,巫建华.赣南龙南地区余田群玄武岩SHRIMP锆石U-Pb年龄及其地质意义[J].地质通报,2012,31(5):716-725.
[5] He Z Y,Xu X S,Niu Y L.Petrogenesis and tectonic significance of a Mesozoic granite-syenite-gabbro association from inland South China[J].Lithos,2010,119(3):621-641.
[6] Jiang Y H,Wang G C,Liu Z,et al.Repeated slab-advance retreat of the Palaeo-Pacific plate underneath SE China[J].International Geology Review,2015,57:472-491.
[7] Li X H,Chen Z G,Liu D Y,et al.Jurassic gabbro-granite-syenite suites from southern Jiangxi Province,SE China:Age,origin and tectonic significance[J].International Geology Review,2003,45:898-921.
[8] 赵希林,毛建仁,刘凯,等.赣南与钨锡矿化有关的九曲二云母花岗岩的形成时代及其岩石成因初探[J].地质论评,2013,59(1):83-96.
[9] 张文兰,华仁民,王汝成,等.赣南漂塘钨矿花岗岩成岩年龄与成矿年龄的精确测定[J].地质学报,2009,83(5):659-670.
[10] 方贵聪,陈毓川,陈郑辉,等.赣南盘古山钨矿床锆石U-Pb和辉钼矿Re-Os年龄及其意义[J].地球学报,2014,35(1):76-84.
[11] 丰成友,黄凡,曾载淋,等.赣南九龙脑岩体及洪水寨云英岩型钨矿年代学[J].吉林大学学报:地球科学版,2011,41(1):111-121.
[12] 丰成友,曾载淋,屈文俊,等.赣南兴国县张家地钼钨矿床成岩成矿时代及地质意义[J].岩石学报,2015,31(3):709-724.
[13] 李丽侠,陈郑辉,施光海,等.江西岿美山钨矿矿床的成矿年龄及地质特征[J].岩矿测试,2014,33(2):287-295.
[14] 刘善宝,王登红,陈毓川,等.赣南兴国留龙金矿田井头复式岩体锆石SHRIMP U-Pb定年及地质意义[J].矿床地质,2010,29(2):290-300.
[15] 王崴平,陈毓川,王登红,等.赣南兴国县良村花岗岩锆石LA-ICP-MS U-Pb年代学、岩石地球化学与成岩机制研究[J].大地构造与成矿学,2014,38(2):347-358.
[16] 陈志刚,李献华,李武显,等.赣南全南正长岩的SHRIMP锆石U-Pb年龄及其对华南燕山早期构造背景的制约[J].地球化学,2003,32(3):223-229.
[17] Whalen J B,Currie K L,Chappell B W.A-type granites:Geochemical characteristics,discrimination and petrogenesis[J].Contributions to Mineralogy & Petrology,1987,95(4):407-419.
[18] Eby G N.Chemical subdivision of A-type granitoids:Petrogenesis and tectonic implications[J].Geology,1992,20(7):641.
[19] 王德滋,赵广涛,邱检生.中国东南部晚中生代A型花岗岩的构造制约[J].高校地质学报,1995,1(2):13-21.
[20] 吴福元,李献华,郑永飞,等.Lu-Hf同位素体系及其岩石学应用[J].岩石学报,2007,23(2):185-220.
[21] 陈培荣,孔兴功,王银喜,等.赣南燕山早期双峰式火山-侵入杂岩的Rb-Sr同位素定年及意义[J].高校地质学报,1999,1(5):378-382.
[22] 邱检生,王德滋,Mcinnes B I A,等.浙闽沿海地区I型-A型复合花岗岩体的地球化学及成因[J].岩石学报,1999,15(2):237-246.
[23] 范春方,陈培荣.赣南陂头A型花岗岩的地质地球化学特征及其形成的构造环境[J].地球化学,2000,29(4):358-366.
[24] 付建明,马昌前,谢才富,等.湘南西山铝质A型花岗质火山侵入杂岩的地球化学及其形成环境[J].地球科学与环境学报,2004,26(4):15-23.
[25] 胡建,邱检生,王德滋,等.中国东南沿海与南岭内陆A型花岗岩的对比及其构造意义[J].高校地质学报,2005,11(3):404-414.
[26] 张岳桥,徐先兵,贾东,等.华南早中生代从印支期碰撞构造体系向燕山期俯冲构造体系转换的形变记录[J].地学前缘,2009,16(1):234-247.
[27] Chen C H,Lee C Y,Shinjo R.Was there Jurassic paleo-Pacific subduction in South China?Constraints from 40Ar/39Ar dating,elemental and Sr-Nd-Pb isotopic geochemistry of the Mesozoic basalts[J].Lithos,2008,106(1):83-92.
[28] 江西省地质局区域地质调查大队.1∶20万兴国幅区域地质调查报告[R].南昌:江西省地质局区域地质调查大队,1978.
[29] Hu Z C,Zhang W,Liu Y S,et al.“Wave” signal smoothing and mercury removing device for laser ablation quadrupole and multiple collector ICP-MS analysis:Application to lead isotope analysis[J].Analytical Chemistry,2015,87(2):1152-1157.
[30] Liu Y S,Gao S,Hu Z C,et al.Continental and oceanic crust recycling-induced melt-peridotite 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(1/2):537-571.
[31] 吴元保,郑永飞.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,2004,49(16):1589.
[32] Middlemost E K.Naming materials in the magma/igneous rock system[J].Earth-Science Reviews,1994,37(3/4):215-224.
[33] Maniar P D,Piccoli P M.Tectonic discrimination of granitoids[J].Journal of Geological Society of America Bulletin,1989,101(5):635-643.
[34] Sun S S,Mcdonough W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes[J].Geological Society London Special Publications,1989,42(1):313-345.
[35] 刘邦秀,李永明.江西省“九五”期间1∶5万区调工作主要进展[J].江西地质,2001,15(3):225-229.
[36] 江西省地质局赣南地质调查大队.1∶5万兴国县幅地质图说明书[R].江西赣州:江西省地质局赣南地质调查大队,1986.
[37] 舒徐洁,陈志洪,朱延辉,等.赣南兴国东固高分异花岗岩成因及地质意义[J].地质论评,2018,64(1):108-126.
[38] King P L,White A J R,Chappell B W,et al.Characterization and origin of aluminous A-type granites from the Lachlan Fold Belt,Southeastern Australia[J].Journal of Petrology,1997,38(3):371-391.
[39] Watson E B.Zircon saturation revisited:Temperature and composition effects in a variety of crustal magma types[J].Earth and Planetary Science Letters,1983,64(2):295-304.
[40] Collins W J,Beams S D,White A J R,et al.Nature and origin of A-type granites with particular reference to southeastern Australia[J].Contributions to Mineralogy & Petrology,1982,80(2):189-200.
[41] Defant M J,Drummond M S.Derivation of some modern arc magmas by melting of young subducted lithosphere [J].Nature,1990,347:662-665.
[42] Guo N X,Zhao Z,Gao J F,et al.Magmatic evolution and W-Sn-U-Nb-Ta mineralization of the Mesozoic Jiulongnao granitic complex,Nanling Range,South China[J].Ore Geology Reviews,2018,94(3):414-434.
[43] 徐先兵,张岳桥,贾东,等.华南早中生代大地构造过程[J].中国地质,2009,36(3):573-593.
[44] 黄子进,付建明,路远发,等.南岭地区五团岩体锆石LA-ICP-MSU-Pb定年、地球化学特征及其地质构造意义[J].地质科技情报,2017,36(6):83-93.