车排子地区车47井石炭系划分及对比

车排子地区车47井3 370.0—3 456.5 m井段为灰黑色含砾粗中粒岩屑砂岩、深灰—灰黑色含砾岩屑砂岩与砂岩互层,夹含碳粉砂岩,岩石组合与建组剖面及白板地等哈拉阿拉特组第六岩性段顶部可对比;在含碳粉砂岩中获得Protohaploxypinus clarus,P. verrucosus,P. junggarensis,P. jimsarensis,Noeggerathiopsidozonotriletes multirugulatus等晚石炭世孢粉化石,时代大致为Moscovian期。上部（井深2 551.2—3 370.0 m）为玄武质—安山质火山角砾岩、火山集块岩等,火山熔岩极少,岩石组合既不同于以火山熔岩为主的哈拉阿拉特组1—4段,又与阿腊德依克赛组下段显著有别,且位于第六岩性段顶部岩屑砂岩之上,可与建组剖面上获得锆石U-Pb年龄为306.9 Ma和304.5 Ma的哈拉阿拉特组第七岩性段对比,可确定其时代为晚石炭世Kasimovian期。

Stratigraphic Division and Correlation of Carboniferous Strata in Well Che 47 in Chepaizi Area

The 3 370.0-3 456.5 m interval of Well Che 47 in the Chepaizi area is composed of grey-black gravel-bearing medium-coarse-grained lithic sandstone, dark-grey-grey-black gravel-bearing lithic sandstone interbedded with sandstone and carbonaceous siltstone. Its rock assemblage can be correlated with that of the top of the six member of Hala’alat formation on formation section and in Baibandi area. The Late Carboniferous sporopollen fossils such as Protohaploxypinus clarus, P. verrucosus, P. junggarensis, P. jimsarensis, Noeggerathiopsidozonotriletes multirugulatus were found in the carbonaceous siltstone, roughly dated to the Moscovian. The upper interval (2 551.2-3 370.0 m) of Well Che 47 mainly consists of basalt-andesite volcanic breccia, volcanic agglomerate, etc., with very little volcanic lava. The rock assemblage in the upper interval is different from the first to fourth members dominated by volcanic lava of Hala’alate formation, and also significantly distinct from the lower member of Aladeyikesai formation. In addition, this upper interval is above the lithic sandstone at the top of the sixth member of Hala’alate formation, and is well correlated with the seventh member (zircon U-Pb age of 306.9 Ma and 304.5 Ma) on the formation section. Thus, this upper interval is dated to the Late Carboniferous Kasimovian.