| 谯常,胡歆睿,何犇,唐佐其,胡荣,邬晓芳,邓毅,杨正文.黔北隆起南缘石炭纪碳酸盐岩沉积环境研究及其地质意义——以修文地区为例[J].贵州地质,2025,42(2):133-141, 157 |
| 黔北隆起南缘石炭纪碳酸盐岩沉积环境研究及其地质意义——以修文地区为例 |
| Research and Its Geological Significance on the Sedimentary Environment of Carboniferous Carbonate Rocks in the Southern Margin of the Qianbei Uplift——Taking Xiuwen Area as an Example |
| 投稿时间：2025-02-23 |
| DOI： |
| 中文关键词: 摆佐组 沉积微相 碳氧同位素 沉积环境 修文地区 |
| 英文关键词:Baizuo formation Sedimentary microfacies Carbon and oxygen isotopes Sedimentary environment Xiuwen area |
| 基金项目:贵州省地矿局地质科研项目(黔地矿科合〔2024〕8号)资助 |
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| 中文摘要: |
| 黔北隆起南缘修文地区是铝土矿富集区，加强含矿层位上覆地层的沉积环境研究，对寻找深部铝土矿显得较为重要。研究区石炭系摆佐组碳酸盐岩古盐度Z值从南往北呈现减少的变化，古温度t值呈现增加的变化，由正常海水逐渐变化到半咸水沉积环境，即反映出修文地区石炭纪时期存在北高南低的古地貌特征。石炭系摆佐组碳酸盐岩共划分6种类型沉积微相，以及局限台地、开阔台地等两个相带。这些特征与下伏石炭系九架炉组含铝岩系及矿体厚度、品位存在一定耦合关系。摆佐组的碳酸盐岩正常海水、无鲕粒灰岩、古温度较低分布区域，铝土矿厚度薄、品位差，而受淡水影响、有鲕粒灰岩、古温度较高区域，铝土矿较厚、品位较高。同时，有摆佐组分布区域一定有九架炉组，反之不存在摆佐组分布区，可能有九架炉组，但含铝岩系厚度及铝土矿品位品质均相对较差。因此，加强石炭系摆佐组碳酸盐岩沉积环境特征的研究，对黔中地区寻找深部铝土矿具一定勘探意义。 |
| 英文摘要: |
| The Xiuwen area on the southern edge of the Qianbei Uplift is an bauxite concentration areaIt’s very improtant to Strengthening the study of the sedimentary environment of the overlying strata of the ore bearing layers is important for for deep bauxite deposits explorationThe paleosalinity Z value of the carbonate rocks in the Baizuo formation of the Carboniferous system in the study area shows a decreasing trend from south to north，the paleotemperature t value shows an increasing trend and gradually changing from normal seawater to a semi saline sedimentary environment，these reflect the paleogeomorphological characteristics of high in the north and low in the south during the Carboniferous period in the Xiuwen areaThe carbonate rocks of the Carboniferous Baizuo formation are divided into six types of sedimentary microfacies，as well as two facies zones:confined platform and open platformThese characteristics have a certain coupling relationship with the aluminum bearing rock series，ore body thickness and grade of the underlying Carboniferous Jiujialu formationThe carbonate rocks of the Baizuo formation are normal seawater，without oolitic limestone，and distributed in areas with lower ancient temperaturesThe bauxite thickness is thin and the grade is poor，while in areas affected by fresh water，with oolitic limestone and higher ancient temperatures，the bauxite thickness is thicker and the grade is higherAt the same time，if there is a distribution area of the Baizuo Formation，there must be a Jiujialu FormationConversely，if there is no distribution area of the Baizuo Formation，there may be a Jiujialu Formation，but the thickness of the aluminum bearing rock series and the quality of the bauxite grade are relatively poorTherefore，strengthening the research on the sedimentary environment characteristics of carbonate rocks in the Carboniferous Baizuo formation has certain exploration significance for the deep bauxite deposits exploration in the central Guizhou region |
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