The Gini-Simpson quadratic index is a classic measure of diversity, widely used by ecologists. As shown recently, however, this index is not suitable for the measurement of beta diversity when the number of species is...The Gini-Simpson quadratic index is a classic measure of diversity, widely used by ecologists. As shown recently, however, this index is not suitable for the measurement of beta diversity when the number of species is very large. The objective of this paper is to introduce the Rich- Gini-Simpson quadratic index which preserves all the qualities of the classic Gini-Simpson index but behaves very well even when the number of species is very large. The additive partitioning of species diversity using the Rich-Gini- Simpson quadratic index and an application from island biogeography are analyzed.展开更多
随着光伏产业和新能源汽车产业的蓬勃发展,国内外锂资源需求持续增加,黏土型锂矿逐渐成为矿产勘查的重点。经地质调查,南漳县西部梁山组黏土岩存在锂的超常富集现象,具备形成独立锂矿床的潜力,而梁山组富锂黏土岩物源特征、沉积环境和...随着光伏产业和新能源汽车产业的蓬勃发展,国内外锂资源需求持续增加,黏土型锂矿逐渐成为矿产勘查的重点。经地质调查,南漳县西部梁山组黏土岩存在锂的超常富集现象,具备形成独立锂矿床的潜力,而梁山组富锂黏土岩物源特征、沉积环境和成矿规律的研究仍为空白。因此,有必要研究南漳县西部梁山组富锂黏土岩物源特征,以进一步揭示其源区地质特征,为后续找矿工作提供有效指导。经测定,南漳县西部梁山组富锂黏土岩样品Al_(2)O_(3)/TiO_(2)比值为14.45~37.69,平均值为27.68;K_(2)O/Al_(2)O_(3)比值为0.0017~0.0206,平均值为0.0098;Cr/Zr比值为0.1449~0.3519,平均值为0.2775。结果表明,黏土岩物源区主要为长英质岩石。La/Sc-Th/Co图解、Zr-TiO_(2)图解中,所有样品点均落在长英质物源区,显示物源的单一性。大多数样品的化学蚀变指数(Chemical Index of Alteration,CIA)、化学风化指数(Chemical Index of Weathering,CIW)均在90以上,说明源岩经历强烈化学风化作用。展开更多
文摘The Gini-Simpson quadratic index is a classic measure of diversity, widely used by ecologists. As shown recently, however, this index is not suitable for the measurement of beta diversity when the number of species is very large. The objective of this paper is to introduce the Rich- Gini-Simpson quadratic index which preserves all the qualities of the classic Gini-Simpson index but behaves very well even when the number of species is very large. The additive partitioning of species diversity using the Rich-Gini- Simpson quadratic index and an application from island biogeography are analyzed.
文摘随着光伏产业和新能源汽车产业的蓬勃发展,国内外锂资源需求持续增加,黏土型锂矿逐渐成为矿产勘查的重点。经地质调查,南漳县西部梁山组黏土岩存在锂的超常富集现象,具备形成独立锂矿床的潜力,而梁山组富锂黏土岩物源特征、沉积环境和成矿规律的研究仍为空白。因此,有必要研究南漳县西部梁山组富锂黏土岩物源特征,以进一步揭示其源区地质特征,为后续找矿工作提供有效指导。经测定,南漳县西部梁山组富锂黏土岩样品Al_(2)O_(3)/TiO_(2)比值为14.45~37.69,平均值为27.68;K_(2)O/Al_(2)O_(3)比值为0.0017~0.0206,平均值为0.0098;Cr/Zr比值为0.1449~0.3519,平均值为0.2775。结果表明,黏土岩物源区主要为长英质岩石。La/Sc-Th/Co图解、Zr-TiO_(2)图解中,所有样品点均落在长英质物源区,显示物源的单一性。大多数样品的化学蚀变指数(Chemical Index of Alteration,CIA)、化学风化指数(Chemical Index of Weathering,CIW)均在90以上,说明源岩经历强烈化学风化作用。