干旱区生态环境知识资源中心(Arid): 云南兰坪思茅盆地江城勐野井钾盐矿床SHK4孔含盐系粘土矿物特征及其成钾环境指示意义

Arid

	云南兰坪思茅盆地江城勐野井钾盐矿床SHK4孔含盐系粘土矿物特征及其成钾环境指示意义
其他题名	Clay Mineral Characteristics of Salt Sequence in Drill Hole SHK4 of the Mengyejing Potassium Deposit of Jiangcheng, Lanping-Simao Basin, Yunnan Province, and Their Sylvite-forming Significance
	苗卫良; 马海州; 张西营; 张玉淑; 李永寿
来源期刊	地球学报
ISSN	1006-3021
出版年	2013
卷号	34 期号:5 页码:537-546
中文摘要	SHK4孔揭示了晚白垩世含盐系勐野井组(K2me)地层, 根据岩性特征将该孔划分为三个粘土矿物单元, 依次反映了从淡化期到成盐期再到淡化期的转换过程。单元Ⅰ粘土矿物主要为伊利石(70.6%)和高岭石(26.7%), 以及极少量的绿泥石(2.7%)。处于高盐度环境下的单元Ⅱ沉积物粘土矿物主要为伊利石(53.6%)和绿泥石(46.4%)。而这一时期物源区面积的急剧减小在一定程度上改变了粘土矿物的输入类型。单元Ⅲ的粘土矿物主要为伊利石(44.5%)、绿泥石(41.8%)和高岭石(10.7%)。另外粘土矿物组合与沉积过程中的卤水演化程度有着良好的对应关系, 表明富K、Mg的高盐度环境对粘土矿物的形成转化应具有一定的制约作用。考虑到含盐系地层发育时研究区的地质构造背景, 以及SHK4孔伊利石结晶度(平均0.35°Delta2theta)与化学指数(>0.5)的特征, 认为埋藏成岩作用对SHK4孔粘土矿物的形成也具有一定程度的影响。
英文摘要	This paper made a detailed study of clay minerals in salt-bearing strata from drill hole SHK4 located in the Jiangcheng potassium salt basin in the south of Yunnan Province. The authors attempted to reveal the distribution of clay mineral assemblage and its influencing factors, and the significance of these factors for salt (potash) formation. According to the lithology and deposition process, the sequence can be subdivided into three clay mineral units that reflect the transition from dilute phase to salt-forming period and dilute phase. Unit I is characterized mainly by illite (70.6%) and kaolinite (26.7%) with minor amounts of chlorite (2.7%), indicating strong chemical weathering under the condition of hot and rainy climate. The sediments of Units II in the hypersaline environment with mainly illite (53.6%) and chlorite (46.4%) represent a hot arid climate. The main source area also decreased sharply in this period, and this situation to some extent changed the type of clay minerals. Minor amounts of kaolinite (10.7%) and large amounts of illite (44.5%) as well as chlorite (41.8%) appear in Units III, suggesting the intensification of chemical weathering. In addition, good correspondence between the clay mineral assemblage and the brine evolution of SHK4 indicates that the hypersaline environment (rich in K, Mg) had certain restriction on the formation and transformation of clay minerals. Besides, based on the geological structure background of the salt forming period and the characteristics of illite crystallinity (an average of 0.35°Delta2theta) and chemical index (>0.5), the authors hold that the burial diagenesis also had some effect on clay formation.
中文关键词	含盐系 ; 粘土矿物分析 ; 高盐度环境 ; 晚白垩世 ; 兰坪思茅盆地
英文关键词	salt-bearing strata analysis of clay minerals hypersaline environment late Cretaceous Lanping-Simao Basin
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:4945571
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/229385
作者单位	中国科学院青海盐湖研究所, 中国科学院盐湖资源与化学重点实验室, 西宁, 青海 810008, 中国
推荐引用方式 GB/T 7714	苗卫良,马海州,张西营,等. 云南兰坪思茅盆地江城勐野井钾盐矿床SHK4孔含盐系粘土矿物特征及其成钾环境指示意义[J],2013,34(5):537-546.
APA	苗卫良,马海州,张西营,张玉淑,&李永寿.(2013).云南兰坪思茅盆地江城勐野井钾盐矿床SHK4孔含盐系粘土矿物特征及其成钾环境指示意义.地球学报,34(5),537-546.
MLA	苗卫良,et al."云南兰坪思茅盆地江城勐野井钾盐矿床SHK4孔含盐系粘土矿物特征及其成钾环境指示意义".地球学报 34.5(2013):537-546.