皖赣相邻地区溪口岩群沉积序列及沉积环境分析
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摘要
溪口岩群为新元古代形成于大陆边缘拉张构造背景下的一套火山-陆缘碎屑岩夹基性火山岩建造组合体,可分为浅海陆棚相、陆棚边缘斜坡相、次深海-陆棚边缘斜坡相、次深海相、次深海-深海相、次深海浊流相6个阶段的沉积相。前3个阶段对应板桥岩组的3个岩段,显示该时期皖赣相邻地区盆地演化处于裂陷发展阶段;后3个阶段反映木坑岩组的3个岩段,显示该时期盆地演化已到成熟阶段。
Xikou Group is an assembly of volcano-terrigenous clastic rock mingled with basic volcanic formation,which is formed in the tectonic settings of episodic tensions during Neoproterozoic Era.The sedimentary facies can be divided into six stages which include neritic shelf,shelf margin slope,bathyal-shelf margin slope,bathyal,bathyal-abyssal and bathyal turbidite.The first three stages correspond to the three rock units in Banqiao Formation,and it indicates that during this period evolution of the basin in the adjoining areas of Anhui and Jiangxi is developing through faulted depression;the last three stages correspond to the three rock units in Mukeng Formation,and it indicates that during this period the evolution of the basin is matured.
Xikou Group is an assembly of volcano-terrigenous clastic rock mingled with basic volcanic formation,which is formed in the tectonic settings of episodic tensions during Neoproterozoic Era.The sedimentary facies can be divided into six stages which include neritic shelf,shelf margin slope,bathyal-shelf margin slope,bathyal,bathyal-abyssal and bathyal turbidite.The first three stages correspond to the three rock units in Banqiao Formation,and it indicates that during this period evolution of the basin in the adjoining areas of Anhui and Jiangxi is developing through faulted depression;the last three stages correspond to the three rock units in Mukeng Formation,and it indicates that during this period the evolution of the basin is matured.
引文
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[19]赵建新,李献华,周国庆,等.皖南和赣东北蛇绿岩成因及其构造意义:元素和Sm-Nd同位素制约[J].地球化学,1995,24(4):311-326.
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[2]张彦杰,周效华,廖圣兵,等.皖赣鄣公山地区新元古代地壳组成及造山过程[J].地质学报,2010,84(10):1401-1427.
[3]周新民,邹海波,杨杰东,等.安徽歙县伏川蛇绿岩套的Sm-Nd等时线年龄及其地质意义[J].科学通报,1989,34(16):1243-1245.
[4]郭令智,卢华复,施央申,等.江南中、新元古代岛弧的运动学和动力学[J].高校地质学报,1996,2(1):1-13.
[5]徐备.论赣东北—皖南晚元古代沟弧盆体系[J].地质学报,1990,64(1):33-42.
[6]徐备,郭令智,施央申,等.皖浙赣地区元古代地体和多期碰撞造山带[M].北京:地质出版社,1992.
[7]舒良树,郭令智,施央申.江南中段板块-地体构造与碰撞造山运动学[M].南京:南京大学出版社,1995.
[8]李献华.扬子南缘沉积岩的Nd同位素演化及其大地构造意义[J].岩石学报,1996,12(3):359-369.
[9]蔡连友,翁望飞,郑光文.皖南郭村钒矿床地质特征及成因分析[J].矿产与地质,2012,26(4):65-70.
[10]张彦杰,孙磊,周效华,等.皖赣相邻区新元古代构造演化探讨[J].地质学刊.2010,34(4):351-357.
[11]张彦杰,周效华,廖圣兵,等.江南造山带北缘鄣源基性岩地质-地球化学特征及成因机制[J].高校地质学报,2011,17(3):393-405.
[12]程光华,汪应庚.江南东段构造格架[J].安徽地质,2000,10(1):1-8.
[13]余心起,江来利,许卫,等.皖浙赣断裂带的界定及其基本特征[J].地学前缘,2007,14(3):102-113.
[14]张永辉.准噶尔盆地沙窝地地区三工河组二段上亚段相序组合类型[J].河南科学,2012,30(8):1133-1136.
[15]杨伟河,施泽明,倪师军.牦牛坪稀土矿区河流沉积环境演化[J].物探与化探,2013,37(3):389-393.
[16]冯建美,张亮.南黄海如东近岸海域的沉积物特征与输运趋势[J].河南科学,2011,29(10):1234-1237.
[17]张彦杰,廖圣兵,周效华,等.皖赣相邻鄣公山地区变泥砂质岩石元素组成特征及源区分析[J].中国地质,2012,(05):1183-1198.
[18]潘含江,程志中,杨榕.德兴铜矿尾矿地球化学特征[J].物探与化探,2013,37(4):627-632.
[19]赵建新,李献华,周国庆,等.皖南和赣东北蛇绿岩成因及其构造意义:元素和Sm-Nd同位素制约[J].地球化学,1995,24(4):311-326.
[20]王希斌,郝梓国.中国造山带蛇绿岩的时空分布及构造类型[J].中国区域地质,1994,9(3):193-204.