【摘要】：陸源碎屑—碳酸鹽混積作用發(fā)生的環(huán)境特征尚不明確,導(dǎo)致對(duì)混積巖分布規(guī)律認(rèn)識(shí)不足。以塔里木盆地巴麥地區(qū)石炭系為例,通過薄片觀察、礦物組成分析、主微量元素分析,對(duì)沉積環(huán)境和古環(huán)境特征參數(shù)進(jìn)行了研究。研究區(qū)混積巖發(fā)育在障壁濱岸、碳酸鹽巖局限臺(tái)地和開闊臺(tái)地。利用與混積強(qiáng)度相關(guān)性極好的Ti、Rb、K和Al的含量,將混積巖定量劃分為4級(jí)。利用Na/Ca比值、Na含量分析了古鹽度特征,Mn/Fe比值和Sr含量分析了古水深,用V/(V+Ni)比值反映了氧化還原條件,并利用Ti/Al,Mg/Sr反映了古氣候特征。研究結(jié)果表明II級(jí)以上混積均發(fā)生在濕潤(rùn)氣候下,而干旱氣候無明顯混積,并且混合沉積大部分發(fā)生在海平面下降階段。碳酸鹽巖開闊臺(tái)地的混積強(qiáng)度僅達(dá)I級(jí),障壁濱岸和碳酸鹽巖局限臺(tái)地的混積強(qiáng)度較高,發(fā)育III級(jí)和IV級(jí)高度混積巖。不同沉積環(huán)境的混合沉積均對(duì)古氣候變化與相對(duì)海平面變化具有良好的響應(yīng),是詳細(xì)的古環(huán)境變化記錄。
[Abstract]:The environmental characteristics of terrestrial clastic carbonate mixing are not clear, which leads to insufficient understanding of the distribution law of mixed rocks. Taking the carbonitic system in Bamai area of Tarim Basin as an example, the characteristic parameters of sedimentary environment and paleoenvironment were studied by means of thin slice observation, mineral composition analysis and main trace element analysis. The mixed rocks in the study area are developed on the barrier bank, and the carbonate rocks are confined to the platform and the open platform. The mixed rocks are divided into 4 grades quantitatively by using the contents of Ti,Rb,K and Al, which are well correlated with the mixing strength. The paleosalinity characteristics, Mn/Fe ratio and Sr content were analyzed by using Na/Ca ratio and Na content. The redox conditions were reflected by V / (V Ni) ratio, and the paleoclimate characteristics were reflected by Ti/Al,Mg/Sr. The results show that the mixing above II grade occurs in humid climate, but there is no obvious mixing in arid climate, and most of the mixed deposition occurs in the stage of sea level decline. The mixing strength of carbonate open platform is only grade I, and the mixing strength of barrier shore and carbonate limited platform is high, and III and IV grade highly mixed rocks are developed. The mixed deposition in different sedimentary environments has a good response to paleoclimate change and relative sea level change, and is a detailed record of paleoenvironmental change.
【作者單位】： 成都理工大學(xué)能源學(xué)院;油氣藏地質(zhì)及開發(fā)工程國(guó)家重點(diǎn)實(shí)驗(yàn)室(成都理工大學(xué));杜倫大學(xué)地球科學(xué)系;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41402096)~~
【分類號(hào)】：P731.23;P736.21

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