【摘要】：鄂爾多斯盆地延長(zhǎng)組長(zhǎng)7段是一套富有機(jī)質(zhì)頁巖,其中富含草莓狀黃鐵礦、有機(jī)質(zhì)紋層、磷灰石等。磷灰石是其中非常重要的一種礦物,它與生物生命活動(dòng)密切相關(guān)。通過巖石薄片、掃描電鏡及能譜分析研究了長(zhǎng)7段富有機(jī)質(zhì)頁巖中磷灰石的巖石學(xué)特征,發(fā)現(xiàn)其主要有兩大類,即生屑磷灰石和膠磷礦;并根據(jù)膠磷礦的重結(jié)晶程度,又將其分為3類:即沒有發(fā)生重結(jié)晶或重結(jié)晶程度極低的膠磷礦、重結(jié)晶程度較低的膠磷礦和重結(jié)晶程度較高的膠磷礦。根據(jù)對(duì)富有機(jī)質(zhì)頁巖和凝灰?guī)r的元素分析,認(rèn)為形成磷灰石的磷元素主要來源于盆地周緣火山噴發(fā)帶來的火山灰沉積物。長(zhǎng)7段富有機(jī)質(zhì)頁巖中磷灰石的形成與生物密切相關(guān),磷灰石的形成機(jī)制有2種:一是生物的直接作用;二是生物的間接作用,其中生物的間接作用是研究區(qū)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.
【作者單位】： 中國石油大學(xué)(北京)油氣資源與探測(cè)國家重點(diǎn)實(shí)驗(yàn)室;中國石油大學(xué)(北京)地球科學(xué)學(xué)院;中國石油長(zhǎng)慶油田分公司;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(“973”計(jì)劃)(編號(hào):2014CB239003)資助
【分類號(hào)】：P618.13

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