贵州施秉下翁哨地区镁铝榴石和铬尖晶石自然重砂罕见特高异常查证
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摘要
综合利用以往资料发现,贵州施秉下翁哨地区存在特高浓度镁铝榴石、铬尖晶石等自然重砂异常,且长期未能解释其来源及金刚石找矿指示问题。由于资料形成于"文革"时期,有人怀疑其可靠性,通过针对性的野外调查和采样分析,佐证了该异常的客观存在和以往资料的可靠性。镁铝榴石和铬尖晶石自然重砂含量水平实属罕见,异常区分布于高出现代河床200m的斜坡上部,残积于古河道砂砾石冲积层(?)中,矿物学分析未见重砂矿物明显的搬运磨蚀痕迹,电子探针分析分属于G9镁铝榴石和S5铬尖晶石,应主要来源于石榴和尖晶二辉橄榄岩,系载体母岩——钾镁煌斑岩就近风化残积的结果。
A comprehensive utilization of the previous data shows that the placer anomaly with high content of chromium-bearing pyrope and chrome spinel exists in Xiawengshao area, Shibing County, Guizhou Province. The source and diamond exploration problems remain unexplained. Because the previous data were obtained during the "Cultural Revolution" period, the reliability of data is doubtful. Targeted field investigation and sampling analysis prove that the placer anomaly is objective and reliable. The high content placer anomalies are very rarely seen. The anomaly is located in the upper part of the slope which is 200 m higher than the elevation of the modern river bed. Residual deposits were deposited in the alluvial deposits of sand and gravel in the ancient channel. Mineralogical analysis shows no obvious traces of transport and abrasion. Electron microprobe analysis indicates G9 pyrope and S5 chrome spinel,which should be mainly derived from garnet-spinel-lherzolite, being the weathering product of the parent rock—lamproite.
A comprehensive utilization of the previous data shows that the placer anomaly with high content of chromium-bearing pyrope and chrome spinel exists in Xiawengshao area, Shibing County, Guizhou Province. The source and diamond exploration problems remain unexplained. Because the previous data were obtained during the "Cultural Revolution" period, the reliability of data is doubtful. Targeted field investigation and sampling analysis prove that the placer anomaly is objective and reliable. The high content placer anomalies are very rarely seen. The anomaly is located in the upper part of the slope which is 200 m higher than the elevation of the modern river bed. Residual deposits were deposited in the alluvial deposits of sand and gravel in the ancient channel. Mineralogical analysis shows no obvious traces of transport and abrasion. Electron microprobe analysis indicates G9 pyrope and S5 chrome spinel,which should be mainly derived from garnet-spinel-lherzolite, being the weathering product of the parent rock—lamproite.
引文
[1]杨光忠.贵州施秉下翁哨含铬镁铝榴石等自然重砂异常初探[J].华东地质,2017,38(增刊):17-19.
[2]杨光忠.简述贵州施秉下翁哨含铬镁铝榴石和镁铬尖晶石重砂异常之谜[J].地质论评,2018,(3):658-664.
[3]贵州省地矿局.贵州省区域地质志[M].北京:地质出版社,1987554-557.
[4]王砚耕.贵州构造基本格架及其特征[C]//贵州区域构造成因构造学术讨论论文集,贵阳:贵州科技出版社,1992:12-16.
[5]池际尚,路凤香.中国原生金刚石成矿地质条件研究[M].武汉:中国地质大学出版社,1996:1-136.
[6]刘彦良,杨坤光,邓新.镇远-贵阳断裂带活动历史及其对黔中隆起演化的制约[J].地质科技情报,2009,28(3):41-47.
[7]张锡贵,石睿,吴寿宁,等.贵州施秉翁哨地区钾镁煌斑岩的新发现及其金刚石找矿意义[J].贵州地质,2015,32(1):37-40.
[8]卢登蓉,任怀翔.贵州省施秉地区金伯利岩与偏碱性超镁铁煌斑岩岩石特征[J].贵州地质,1987,4(1):73-82
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[10]章人骏.论沅水流域及其邻区寻找金刚石原生矿的前景[J].湖南地质,1985,4(1):1-14.
[11]张安棣,谢锡林,郭立鹤,等.金刚石找矿指示矿物研究及数据库[M].北京:科学技术出版社,1991:54-100.
[12]董振信.中国金伯利岩[M].北京:科学出版社,1994:53.
[13]张琳,张大可,张素荣,等.剥蚀-沉积平衡机制与自然重砂测量找矿[J].地质通报,2014,33(12):1949-1955.
[14]马大铨.贵州马坪云母金伯利岩及伴生偏碱性超基性岩的岩石征[J].中国地质科学院宜昌地质矿产研究所刊(7).北京:地质出版社,1983:65-75.
[15]Mei H J,Tang C J,Li S R,et al.Lamproites and kimberlites in China and the genesis of diamond deposit[J].Science in China(D),1998,43(supp):83-92.
[16]方维萱,胡瑞忠,苏文超,等.贵州镇远地区钾镁煌斑岩类的侵位时代[J].科学通报,2002,47(4):307-312.
[17]杨光忠,李永刚,张与伦,等.黔东钾镁煌斑岩分布控制因素及其侵位模式[J].地质通报,2019,38(1):27-35.
[18]余开富,王守德.贵州南部的都匀运动及其古构造特征和石油地质意义[J].贵州地质,1995,12(3):225-232.
[19]邓新,杨坤光,刘彦良,等.黔中隆起性质及其构造演化[J].地学前缘,2010,17(3):79-89.
(1)贵州一〇一地质队革命委员会.贵州省镇远县马坪地区金刚石原生矿详查报告. 1973:1-96.
(2)贵州省地质一〇一地质大队.贵州省施秉县翁哨地区一九七九年金刚石原生矿普查报告. 1979:1-45.
(3)贵州省地质局101地质大队.贵州省施秉县翁哨地区一九八〇年金刚石原生矿普查报告. 1981:1-15.
(4)贵州省地质局101地质大队.贵州省余庆—旧州地区金刚石原生矿普查地质报告. 1986:1-47.
(5)贵州一〇一地质队革命委员会.贵州省镇远县马坪地区金刚石原生矿详查报告. 1973:1-96.
(6)贵州省地质局101地质大队.贵州省施秉地区金伯利岩与碱性超镁铁煌斑岩岩石特征. 1983:1-40.
[2]杨光忠.简述贵州施秉下翁哨含铬镁铝榴石和镁铬尖晶石重砂异常之谜[J].地质论评,2018,(3):658-664.
[3]贵州省地矿局.贵州省区域地质志[M].北京:地质出版社,1987554-557.
[4]王砚耕.贵州构造基本格架及其特征[C]//贵州区域构造成因构造学术讨论论文集,贵阳:贵州科技出版社,1992:12-16.
[5]池际尚,路凤香.中国原生金刚石成矿地质条件研究[M].武汉:中国地质大学出版社,1996:1-136.
[6]刘彦良,杨坤光,邓新.镇远-贵阳断裂带活动历史及其对黔中隆起演化的制约[J].地质科技情报,2009,28(3):41-47.
[7]张锡贵,石睿,吴寿宁,等.贵州施秉翁哨地区钾镁煌斑岩的新发现及其金刚石找矿意义[J].贵州地质,2015,32(1):37-40.
[8]卢登蓉,任怀翔.贵州省施秉地区金伯利岩与偏碱性超镁铁煌斑岩岩石特征[J].贵州地质,1987,4(1):73-82
[9]罗会文,杨光树.贵州省镇远地区钾镁煌斑岩岩石特征[J].岩石矿物学杂志,1989,8(2):3-15.
[10]章人骏.论沅水流域及其邻区寻找金刚石原生矿的前景[J].湖南地质,1985,4(1):1-14.
[11]张安棣,谢锡林,郭立鹤,等.金刚石找矿指示矿物研究及数据库[M].北京:科学技术出版社,1991:54-100.
[12]董振信.中国金伯利岩[M].北京:科学出版社,1994:53.
[13]张琳,张大可,张素荣,等.剥蚀-沉积平衡机制与自然重砂测量找矿[J].地质通报,2014,33(12):1949-1955.
[14]马大铨.贵州马坪云母金伯利岩及伴生偏碱性超基性岩的岩石征[J].中国地质科学院宜昌地质矿产研究所刊(7).北京:地质出版社,1983:65-75.
[15]Mei H J,Tang C J,Li S R,et al.Lamproites and kimberlites in China and the genesis of diamond deposit[J].Science in China(D),1998,43(supp):83-92.
[16]方维萱,胡瑞忠,苏文超,等.贵州镇远地区钾镁煌斑岩类的侵位时代[J].科学通报,2002,47(4):307-312.
[17]杨光忠,李永刚,张与伦,等.黔东钾镁煌斑岩分布控制因素及其侵位模式[J].地质通报,2019,38(1):27-35.
[18]余开富,王守德.贵州南部的都匀运动及其古构造特征和石油地质意义[J].贵州地质,1995,12(3):225-232.
[19]邓新,杨坤光,刘彦良,等.黔中隆起性质及其构造演化[J].地学前缘,2010,17(3):79-89.
(1)贵州一〇一地质队革命委员会.贵州省镇远县马坪地区金刚石原生矿详查报告. 1973:1-96.
(2)贵州省地质一〇一地质大队.贵州省施秉县翁哨地区一九七九年金刚石原生矿普查报告. 1979:1-45.
(3)贵州省地质局101地质大队.贵州省施秉县翁哨地区一九八〇年金刚石原生矿普查报告. 1981:1-15.
(4)贵州省地质局101地质大队.贵州省余庆—旧州地区金刚石原生矿普查地质报告. 1986:1-47.
(5)贵州一〇一地质队革命委员会.贵州省镇远县马坪地区金刚石原生矿详查报告. 1973:1-96.
(6)贵州省地质局101地质大队.贵州省施秉地区金伯利岩与碱性超镁铁煌斑岩岩石特征. 1983:1-40.