成都理工大学学报（自然科学版）Issue(1)：68-76,9.DOI:10.3969/j.issn.1671-9727.2016.01.07
川西北汉旺地区卡尼期鲕粒灰岩特征及地质意义
Characteristics and geological significance of the late Triassic Carnian oolitic limestone in Hanwang area, northwest Sichuan Basin,China
摘要
Abstract
Sedimentary facies,paleoclimate and paleosalinity of late Triassic Carnian oolitic limestone in the lower part of Ma'antang Formation,northwest Sichuan Basin are studied based on former achievements,field investigation and sedimentary facies analysis.The Carnian limestone section is composed of three parts,occurred as composite oolite,concentric oolite,radial-concentric oolite and brain-like oolite from the bottom to top,and they are mainly deposited on carbonate ramps under the condition of decreased seawater energy and deep sea water.However,the coexistence of brain-like oolite and concentric oolite on the top of the limestone and the bimodal size distribution of concentric oolite reveal that the formation of oolites is affected storm during the deposition.According to the analysis ofδ18 O andδ13 C,the paleotemperature is 24 ~35℃ and the Z value is 127 ~131 during the deposition of oolitic limestone.It implies that the northwest Sichuan Basin was an area with high evaporation and low latitudes and characterized by hot dry climates in early Carnian of the late Triassic.Oolitic limestone in the area is of great importance in the analysis and reconstruction of paleogeography and paleotemperature.关键词
川西北/卡尼期/鲕粒灰岩/碳酸盐岩缓坡/古气候Key words
Sichuan Basin/Carnian/oolitic limestone/carbonate gentle slope/paleoclimate分类
天文与地球科学引用本文复制引用
姬国锋,范鸿,时志强,杜怡星..川西北汉旺地区卡尼期鲕粒灰岩特征及地质意义[J].成都理工大学学报（自然科学版）,2016,(1):68-76,9.基金项目
国家自然科学基金资助项目（41272131）。 （）
