庐江-枞阳矿集区深部结构与成矿
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摘要
为探测长江中下游成矿带庐江-枞阳白垩纪火山岩盆地和铁、硫矿集区深部构造和地壳结构,探讨成矿深部控制条件,作者完成了穿越火山岩盆地的深反射地震剖面(记录30s)和罗河铁矿区浅层高分辨反射地震剖面,揭示了矿集区全地壳精细结构,同时开展区域构造测量和应力场反演研究,获得了新的认识。证实"耳状"的庐-枞火山岩盆地是一个沿北东向罗河断裂向东发育的非对称火山盆地,排除了另一半被断在西侧红层之下的判断;罗河断裂是一条切穿MOHO的深断裂,倾向南东,是引导地幔流体和岩浆上涌和喷发的通道;鉴别出多层界面,火山岩-侏罗系砂岩厚约4-5km(其中火山岩厚度约3km),三叠系-震旦系变形层底界深度大致18-20km,变质基底组成中下地壳,MOHO平缓向西北倾,深度33-31km;追踪郯-庐断裂带的深部产状,陡立延伸到MOHO,宽约10km。
In order to explore the deep structure and crustal frame of Lujiang-Zongyang iron and sulfur ore con- centrated area and volcanic basin in middle-lower Yangtze valley metallogenic belt during Cretaceous, and discuss deep metallogenic control conditions. We finished deep reflection seismic profile through volcanic basin (recorded 30 s) and shallow high resolution reflection seismic profile in Luohe iron diggings and discovered whole fine crustal structure, surveyed regional structure and stress field characteristics simultaneously, and obtained latest Cognition. It was confirmed that the ear-shape Luzong basin was a dissymmetrical basin along Luohe fault with north-east strike direction and eliminated the judgment that another half basin was buried, below red layer, west side of Luohe fault. The Luohe fault was a deep fault which cut through MOHO, the dip was south-east, and it also was the surging and eruption channel of magma and mantle fluid; we also identified multi-layer interfaces, the thickness of the volcanic rocks and sandstones was ca. 4-5 km (the thickness of volcanic rocks was ca. 3 km), the depth of deformation bottom layer from Triassic to Sinian was ca. 18-20 km, the metamorphic basement formed middle and lower crust, the dip of MOHO surface was north-west, depth was ca. 33-31 km; the deep occurrence of Tanlu fault was steep and cut through MOHO, width was ca. 10 km.
In order to explore the deep structure and crustal frame of Lujiang-Zongyang iron and sulfur ore con- centrated area and volcanic basin in middle-lower Yangtze valley metallogenic belt during Cretaceous, and discuss deep metallogenic control conditions. We finished deep reflection seismic profile through volcanic basin (recorded 30 s) and shallow high resolution reflection seismic profile in Luohe iron diggings and discovered whole fine crustal structure, surveyed regional structure and stress field characteristics simultaneously, and obtained latest Cognition. It was confirmed that the ear-shape Luzong basin was a dissymmetrical basin along Luohe fault with north-east strike direction and eliminated the judgment that another half basin was buried, below red layer, west side of Luohe fault. The Luohe fault was a deep fault which cut through MOHO, the dip was south-east, and it also was the surging and eruption channel of magma and mantle fluid; we also identified multi-layer interfaces, the thickness of the volcanic rocks and sandstones was ca. 4-5 km (the thickness of volcanic rocks was ca. 3 km), the depth of deformation bottom layer from Triassic to Sinian was ca. 18-20 km, the metamorphic basement formed middle and lower crust, the dip of MOHO surface was north-west, depth was ca. 33-31 km; the deep occurrence of Tanlu fault was steep and cut through MOHO, width was ca. 10 km.
引文
常印佛,刘湘培,吴言昌.1991.长江中下游铜铁成矿带[M].北京:地质出版社,134-147.
陈江峰,周泰禧,邢凤鸣,徐祥,徐立华.1994.长江中下游岩带含铜岩体的Pb、Sr、Nd同位素特征[J].地球学报,1-2:111-116.
董树文,吴宣志,高瑞,卢德源,李英康,何义权,汤加富,曹奋扬,侯明金,黄得志.1998.大别造山带地壳速度结构与动力学[J].地球物理学报,41(3):349-361.
董树文,张岳桥,陈宣华,龙长兴,王涛,杨振宇,胡健民.2008.晚侏罗世东亚多向汇聚构造体系的形成与变形特征[J].地球学报,29(3):306-317.
董树文,张岳桥,龙长兴,杨振宇,季强,王涛,胡建民,陈宣华.2007.中国侏罗纪构造变革与燕山运动新诠释[J].地质学报,81(11):1449-1461.
董树文.1991.长江中下游铁铜矿带成因之构造分析[J].中国地质科学院院报,23:43-56.
刘洪,邱检生,罗清华,徐夕生,凌文黎,王德滋.2002.安徽庐枞中生代富钾火山岩成因的地球化学制约[J].地球化学,31(2):129-140.
任启江,刘孝善,徐兆文,邱德同,胡文瑄,方昌泉,阮惠础,董火根,李兆麟,吴启志.1991.安徽庐枞中生代火山构造洼地及其成矿作用[M].北京:地质出版社,1-206.
任启江,王德滋,徐兆文,董火根,潘龙泉,杨荣勇,方昌泉,胡进安.1993.安徽庐枞火山―构造洼地的形成、演化及成矿[J].地质学报,67(2):131-145.
王德滋,任启江,邱检生,陈克荣,徐兆文,曾家湖.1996.中国东部橄榄安粗岩省的火山岩特征及其成矿作用[J].地质学报,70(1):23-34.
谢成龙,朱光,牛漫兰,王勇生,向必伟,胡召齐.2008.郯庐断裂带巢湖-庐江段晚中生代火山岩的锆石U-Pb年代学[J].地质科学,43(2):294-308.
于学元,白正华.1981.庐枞地区安粗岩系[J].地球化学,1:57-64.
张荣华,刘隆隆,陆成庆.1979.长江中下游某些火山岩铁矿微量元素的地球化学[J].地球学报,1(1):83-108.
周涛发,范裕,袁峰,陆三明,尚世贵,David Cooke,Sebastien Meffre,赵国春.2008.安徽庐枞(庐江-枞阳)盆地火山岩的年代学及其意义[J].中国科学D辑,38(11):1342-1353.
周涛发,宋明义,范裕,袁峰,刘珺,吴明安,钱存超,陆三明.2007.安徽庐枞盆地中巴家滩岩体的年代学研究及其意义[J].岩石学报,23(10):2379-2386.
CHANG Yin-fu,LIU Xiang-pei,WU Yan-chang.1991.Iron-copper mineralization belt of middle-lower Yangtze valley[M].Bei-jing:Geological Press,134-147(in Chinese).
CHEN Jiang-feng,ZHOU Tai-xi,XING Feng-ming,XU Xiang,XU Li-hua.1994.Pb,Sr,and Nd isotope characteristics of cop-per-bearing rocks from middle-lower area of Yangtze[J].Acta Geoscientica Sinica,1-2:111-116(in Chinese with English ab-stract).
DONG Shu-wen,WU Xuan-zhi,GAO Rui,LU De-yuan,LI Ying-kang,HE Yi-quan,TANG Jia-fu,CAO Feng-yang,HOU Ming-jin,HUANG De-zhi.1998.On the crust velocity levels and dynamics of the Dabieshan orogeneic belt[J].Acta Geo-physica Sinica,41(3):349-361(in Chinese with English ab-stract).
DONG Shu-wen,ZHANG Yue-qiao,CHEN Xuan-hua,LONG Chang-xin,WANG Tao,YANG Zhen-yu,HU Jian-min.2008.The formation and deformational characteristics of East Asia Multi-Direction convergent tectonic system in late Jurassic[J].Acta Geoscientica Sinica,29(3):306-317(in Chinese with English abstract).
DONG Shu-wen,ZHANG Yue-qiao,LONG Chang-xin,YANG Zhen-yu,JI Qiang,WANG Tao,HU Jian-min,CHEN Xuan-hua.2007.Jurassic tectonic revolution in China and new interpretation of the Yanshan movement[J].Acta Geologica Sinica,81(11):1449-1461(in Chinese with English abstract).
DONG Shu-wen,ZHANG Yue-qiao,LONG Chang-xin,YANGZhen-yu,JI Qiang,WANG Tao,HU Jian-min,CHEN Xuan-hua.2008.Jurassic tectonic revolution in China and new interpretation of the“Yanshan movement”[J].Acta Geologica Sinica(English edition),82(2):334-347.
DONG Shu-wen.1991.Tectonic analysis of genesis on iron-copper mineralization belt in middle-lower Yangtze valley[J].Acta Geoscientica Sinica,23:43-56(in Chinese with English ab-stract).
LIU Hong,QIU Jian-sheng,LUO Qing-hua,XU Xi-sheng,LIN Wen-li,WANG De-zi.2002.Petrogenesis of the Mesozoic potash-rich volcanic rocks in the Luzong basin,Anhui Prov-ince:Geochemical constraints[J].Geochimica,31(2):129-140(in Chinese with English abstract).
REN Qi-jiang,LIU Xiao-shan,XU Zhao-wen,QIU De-tong,HU Wen-xuan,FANG Chang-quan,RUAN Hui-chu,DONG Huo-gen,LI Zhao-lin,WU Qi-zhi.1991.Mesozoic volcanic structural depression and its mineralization in Luzong region of Anhui[M].Beijing:Geological Press,1-206(in Chinese).
REN Qi-jiang,WANG De-zi,XU Zhao-wen,DONG Huo-gen,PAN Long-quan,YANG Rong-yong,FANG Chang-quan,HU Jin-an.1993.Forming,evolution and mineralization of vol-canic-structural depression in Luzong region of Anhui[J].Acta Geologica Sinica,67(2):131-145(in Chinese with Eng-lish abstract).
WANG De-zi,REN Qi-jiang,QIU Jian-sheng,CHEN Ke-rong,XU Zhao-wen,ZEN Jia-hu.1996.Characteristics of volcanic rocks in the shoshonite province,eastern China,and their metal-logenesis[J].Acta Geologica Sinica,70(1):23-34(in Chinese with English abstract).
XIE Cheng-long,ZHU Guang,NIU Man-lan,WANG Yong-sheng,XIANG Bi-wei,HU Zhao-qi.2008.Zircon U-Pb geochronol-ogy of the Late Mesozoic volcanic rocks from the Chaohu-Lujiang segment of the Tan-Lu fault zone[J].Chinese Journal of Geology,43(2):294-308(in Chinese with English abstract).
YU Xue-yuan,BAI Zheng-hua.1981.Latitic series in Lujiang-Zongyang region[J].Geochimica,1:57-64(in Chinese with English abstract).
ZHANG Rong-hua,LIU Long-long,LU Cheng-qing.1979.On geochemistry of trace elements of several porphyrite iron de-posits along the middle lower Changjiang valley[J].Acta Geoscientica Sinica,1(1):83-108(in Chinese with English ab-stract).
ZHOU Tao-fa,FAN Yu,YUAN Feng,LU San-ming,SHANG Shi-gui,COOKE D,MEFFRE S,ZHAO Guo-chun,2008.Chronology and its meaning of volcanic rocks in Lu-zong(Lujiang-Zongyang)basin,Anhui province[J].Science in China Series D,38(11):1342-1353(in Chinese with English abstract).
ZHOU Tao-fa,SONG Ming-yi,FAN Yu,YUAN Feng,LIU Jun,WU Ming-an,QIAN Cun-chao,LU San-ming.2007.Chro-nology of the Bajiatan intrusion in the luzong basin,Anhui,and its significance[J].Acta Petrologica,23(10):2379-2386(in Chinese with English abstract).
陈江峰,周泰禧,邢凤鸣,徐祥,徐立华.1994.长江中下游岩带含铜岩体的Pb、Sr、Nd同位素特征[J].地球学报,1-2:111-116.
董树文,吴宣志,高瑞,卢德源,李英康,何义权,汤加富,曹奋扬,侯明金,黄得志.1998.大别造山带地壳速度结构与动力学[J].地球物理学报,41(3):349-361.
董树文,张岳桥,陈宣华,龙长兴,王涛,杨振宇,胡健民.2008.晚侏罗世东亚多向汇聚构造体系的形成与变形特征[J].地球学报,29(3):306-317.
董树文,张岳桥,龙长兴,杨振宇,季强,王涛,胡建民,陈宣华.2007.中国侏罗纪构造变革与燕山运动新诠释[J].地质学报,81(11):1449-1461.
董树文.1991.长江中下游铁铜矿带成因之构造分析[J].中国地质科学院院报,23:43-56.
刘洪,邱检生,罗清华,徐夕生,凌文黎,王德滋.2002.安徽庐枞中生代富钾火山岩成因的地球化学制约[J].地球化学,31(2):129-140.
任启江,刘孝善,徐兆文,邱德同,胡文瑄,方昌泉,阮惠础,董火根,李兆麟,吴启志.1991.安徽庐枞中生代火山构造洼地及其成矿作用[M].北京:地质出版社,1-206.
任启江,王德滋,徐兆文,董火根,潘龙泉,杨荣勇,方昌泉,胡进安.1993.安徽庐枞火山―构造洼地的形成、演化及成矿[J].地质学报,67(2):131-145.
王德滋,任启江,邱检生,陈克荣,徐兆文,曾家湖.1996.中国东部橄榄安粗岩省的火山岩特征及其成矿作用[J].地质学报,70(1):23-34.
谢成龙,朱光,牛漫兰,王勇生,向必伟,胡召齐.2008.郯庐断裂带巢湖-庐江段晚中生代火山岩的锆石U-Pb年代学[J].地质科学,43(2):294-308.
于学元,白正华.1981.庐枞地区安粗岩系[J].地球化学,1:57-64.
张荣华,刘隆隆,陆成庆.1979.长江中下游某些火山岩铁矿微量元素的地球化学[J].地球学报,1(1):83-108.
周涛发,范裕,袁峰,陆三明,尚世贵,David Cooke,Sebastien Meffre,赵国春.2008.安徽庐枞(庐江-枞阳)盆地火山岩的年代学及其意义[J].中国科学D辑,38(11):1342-1353.
周涛发,宋明义,范裕,袁峰,刘珺,吴明安,钱存超,陆三明.2007.安徽庐枞盆地中巴家滩岩体的年代学研究及其意义[J].岩石学报,23(10):2379-2386.
CHANG Yin-fu,LIU Xiang-pei,WU Yan-chang.1991.Iron-copper mineralization belt of middle-lower Yangtze valley[M].Bei-jing:Geological Press,134-147(in Chinese).
CHEN Jiang-feng,ZHOU Tai-xi,XING Feng-ming,XU Xiang,XU Li-hua.1994.Pb,Sr,and Nd isotope characteristics of cop-per-bearing rocks from middle-lower area of Yangtze[J].Acta Geoscientica Sinica,1-2:111-116(in Chinese with English ab-stract).
DONG Shu-wen,WU Xuan-zhi,GAO Rui,LU De-yuan,LI Ying-kang,HE Yi-quan,TANG Jia-fu,CAO Feng-yang,HOU Ming-jin,HUANG De-zhi.1998.On the crust velocity levels and dynamics of the Dabieshan orogeneic belt[J].Acta Geo-physica Sinica,41(3):349-361(in Chinese with English ab-stract).
DONG Shu-wen,ZHANG Yue-qiao,CHEN Xuan-hua,LONG Chang-xin,WANG Tao,YANG Zhen-yu,HU Jian-min.2008.The formation and deformational characteristics of East Asia Multi-Direction convergent tectonic system in late Jurassic[J].Acta Geoscientica Sinica,29(3):306-317(in Chinese with English abstract).
DONG Shu-wen,ZHANG Yue-qiao,LONG Chang-xin,YANG Zhen-yu,JI Qiang,WANG Tao,HU Jian-min,CHEN Xuan-hua.2007.Jurassic tectonic revolution in China and new interpretation of the Yanshan movement[J].Acta Geologica Sinica,81(11):1449-1461(in Chinese with English abstract).
DONG Shu-wen,ZHANG Yue-qiao,LONG Chang-xin,YANGZhen-yu,JI Qiang,WANG Tao,HU Jian-min,CHEN Xuan-hua.2008.Jurassic tectonic revolution in China and new interpretation of the“Yanshan movement”[J].Acta Geologica Sinica(English edition),82(2):334-347.
DONG Shu-wen.1991.Tectonic analysis of genesis on iron-copper mineralization belt in middle-lower Yangtze valley[J].Acta Geoscientica Sinica,23:43-56(in Chinese with English ab-stract).
LIU Hong,QIU Jian-sheng,LUO Qing-hua,XU Xi-sheng,LIN Wen-li,WANG De-zi.2002.Petrogenesis of the Mesozoic potash-rich volcanic rocks in the Luzong basin,Anhui Prov-ince:Geochemical constraints[J].Geochimica,31(2):129-140(in Chinese with English abstract).
REN Qi-jiang,LIU Xiao-shan,XU Zhao-wen,QIU De-tong,HU Wen-xuan,FANG Chang-quan,RUAN Hui-chu,DONG Huo-gen,LI Zhao-lin,WU Qi-zhi.1991.Mesozoic volcanic structural depression and its mineralization in Luzong region of Anhui[M].Beijing:Geological Press,1-206(in Chinese).
REN Qi-jiang,WANG De-zi,XU Zhao-wen,DONG Huo-gen,PAN Long-quan,YANG Rong-yong,FANG Chang-quan,HU Jin-an.1993.Forming,evolution and mineralization of vol-canic-structural depression in Luzong region of Anhui[J].Acta Geologica Sinica,67(2):131-145(in Chinese with Eng-lish abstract).
WANG De-zi,REN Qi-jiang,QIU Jian-sheng,CHEN Ke-rong,XU Zhao-wen,ZEN Jia-hu.1996.Characteristics of volcanic rocks in the shoshonite province,eastern China,and their metal-logenesis[J].Acta Geologica Sinica,70(1):23-34(in Chinese with English abstract).
XIE Cheng-long,ZHU Guang,NIU Man-lan,WANG Yong-sheng,XIANG Bi-wei,HU Zhao-qi.2008.Zircon U-Pb geochronol-ogy of the Late Mesozoic volcanic rocks from the Chaohu-Lujiang segment of the Tan-Lu fault zone[J].Chinese Journal of Geology,43(2):294-308(in Chinese with English abstract).
YU Xue-yuan,BAI Zheng-hua.1981.Latitic series in Lujiang-Zongyang region[J].Geochimica,1:57-64(in Chinese with English abstract).
ZHANG Rong-hua,LIU Long-long,LU Cheng-qing.1979.On geochemistry of trace elements of several porphyrite iron de-posits along the middle lower Changjiang valley[J].Acta Geoscientica Sinica,1(1):83-108(in Chinese with English ab-stract).
ZHOU Tao-fa,FAN Yu,YUAN Feng,LU San-ming,SHANG Shi-gui,COOKE D,MEFFRE S,ZHAO Guo-chun,2008.Chronology and its meaning of volcanic rocks in Lu-zong(Lujiang-Zongyang)basin,Anhui province[J].Science in China Series D,38(11):1342-1353(in Chinese with English abstract).
ZHOU Tao-fa,SONG Ming-yi,FAN Yu,YUAN Feng,LIU Jun,WU Ming-an,QIAN Cun-chao,LU San-ming.2007.Chro-nology of the Bajiatan intrusion in the luzong basin,Anhui,and its significance[J].Acta Petrologica,23(10):2379-2386(in Chinese with English abstract).
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