鄂尔多斯盆地长7段富有机质页岩中磷灰石类型及其成因
发布时间：2019-05-07 07:50
【摘要】：鄂尔多斯盆地延长组长7段是一套富有机质页岩,其中富含草莓状黄铁矿、有机质纹层、磷灰石等。磷灰石是其中非常重要的一种矿物,它与生物生命活动密切相关。通过岩石薄片、扫描电镜及能谱分析研究了长7段富有机质页岩中磷灰石的岩石学特征,发现其主要有两大类,即生屑磷灰石和胶磷矿;并根据胶磷矿的重结晶程度,又将其分为3类:即没有发生重结晶或重结晶程度极低的胶磷矿、重结晶程度较低的胶磷矿和重结晶程度较高的胶磷矿。根据对富有机质页岩和凝灰岩的元素分析,认为形成磷灰石的磷元素主要来源于盆地周缘火山喷发带来的火山灰沉积物。长7段富有机质页岩中磷灰石的形成与生物密切相关,磷灰石的形成机制有2种:一是生物的直接作用;二是生物的间接作用,其中生物的间接作用是研究区磷灰石形成的主要形式。
[Abstract]:Chang 7 member of Yanchang formation in Ordos Basin is a set of organic shale rich in strawberry pyrite, organic matter layer, apatite and so on. Apatite is one of the most important minerals, which is closely related to biological life activities. The petrological characteristics of apatite in organic shale of Chang 7 member are studied by means of thin rock slices, scanning electron microscopy and energy spectrum analysis. It is found that there are two main types of apatite in Chang 7 member, namely, raw debris apatite and collophanite. According to the recrystallization degree of collophane, it can be divided into three categories: no recrystallization or very low recrystallization, lower recrystallization and higher recrystallization. Based on the elemental analysis of organic shale and tuff, it is concluded that the phosphorous elements forming apatite are mainly derived from volcanic ash sediments caused by volcanic eruptions around the basin. The formation of apatite in organic shale of Chang 7 member is closely related to organism. There are two kinds of formation mechanism of apatite: one is the direct action of organism; The second is the indirect action of organisms, in which the indirect action of organisms is the main form of apatite formation in the study area.
【作者单位】： 中国石油大学(北京)油气资源与探测国家重点实验室;中国石油大学(北京)地球科学学院;中国石油长庆油田分公司;
【基金】：国家重点基础研究发展计划(“973”计划)(编号:2014CB239003)资助
【分类号】：P618.13
[Abstract]:Chang 7 member of Yanchang formation in Ordos Basin is a set of organic shale rich in strawberry pyrite, organic matter layer, apatite and so on. Apatite is one of the most important minerals, which is closely related to biological life activities. The petrological characteristics of apatite in organic shale of Chang 7 member are studied by means of thin rock slices, scanning electron microscopy and energy spectrum analysis. It is found that there are two main types of apatite in Chang 7 member, namely, raw debris apatite and collophanite. According to the recrystallization degree of collophane, it can be divided into three categories: no recrystallization or very low recrystallization, lower recrystallization and higher recrystallization. Based on the elemental analysis of organic shale and tuff, it is concluded that the phosphorous elements forming apatite are mainly derived from volcanic ash sediments caused by volcanic eruptions around the basin. The formation of apatite in organic shale of Chang 7 member is closely related to organism. There are two kinds of formation mechanism of apatite: one is the direct action of organism; The second is the indirect action of organisms, in which the indirect action of organisms is the main form of apatite formation in the study area.
【作者单位】： 中国石油大学(北京)油气资源与探测国家重点实验室;中国石油大学(北京)地球科学学院;中国石油长庆油田分公司;
【基金】：国家重点基础研究发展计划(“973”计划)(编号:2014CB239003)资助
【分类号】：P618.13
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