干旱区生态环境知识资源中心(Arid): 白垩纪钙质古土壤的发生学特征及古环境意义

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	白垩纪钙质古土壤的发生学特征及古环境意义
其他题名	CRETACEOUS CALCAREOUS PALEOSOLS:PEDOGENETIC CHARACTERISTICS AND PALEOENVIRONMENTAL IMPLICATIONS
	黄成敏 1; 王成善
来源期刊	土壤学报
ISSN	0564-3929
出版年	2010
卷号	47 期号:6 页码:1029-1038
中文摘要	古土壤形成于过去环境,是揭示环境变化历史的重要材料.新近纪(23.03 M a)以前形成的古土壤,年代久远,埋藏深,受成岩作用改造强烈,其发生学特征研究是古环境重建的基础.本文通过对白垩纪时期不同地点的钙质古土壤的发生学研究,拟恢复研究区域古环境.研究表明,古土壤剖面中的A层和B层形态分别产生变化,但层次差异依然明显,且表层土壤有机质含量一般高于表下层,钙积层(Bk)普遍发生并富含碳酸盐结核.可以观察到古土壤中方解石沿根孔淀积特征以及具滑擦面.钙质古土壤质地偏粗,为壤质砂土和砂质壤土.古土壤Bk层中的Ca,Mn,Sr相对富集,其余常量元素与Ba,Sc,Nb,Th,U,Cr,V,Co,N i等元素降低;deltaCe和deltaEu负异常以及相对富集重稀土元素.分别按照中国土壤分类系统和美国土壤系统分类两种分类体系进行了古土壤分类.由古土壤类型和特征可以推断白垩纪不同时期,在四川盆地梓潼巴中地区,辽宁金岭寺羊山盆地和松辽盆地出现过半湿润至半干旱的气候环境
英文摘要	Paleosols formed during the geological past are archives of paleoenvironment.Although pre-Neogene paleosols were formed a long long time ago,buried deep and subjected to strong diagenetic alteration,their pedogenetic characteristics are the basis for studying and reconstructing paleoenvironment.In an attempt to reconstruct paleoenvironment of the study regions,where calcareous paleosols of Cretaceous were discovered at several localities,a research project was launched to study pedogenesis of the paleosols.Results show that A-and B-horizons of the soils altered morphologically,but the difference between the two remained distinct;organic matter contents were generally higher in the surface soil layer than in the subsurface layer,and a calcic horizon(Bk) was commonly spotted abundant in carbonate nodules.Slickensided peds and precipitation of the calcites along the plant roots were observed in thin sections of the paleosols.The paleosols were sorted as loamy sand and sandy loam with texture being a bit too coarse.The Bk horizons of the soils were relatively enriched with Ca,Mn and Sr,but quite low in other macro-and micro-elements,like Ba,Sc,Nb,Th,U,Cr,V,Co and Ni.And negative anomaly of deltaCe and deltaEu as well as enrichment of heavy rare earth elements were detected in Bk horizons relative to A hozrions in paleosols.Classification of the paleosols in line with the Chinese Soil Taxonomy and US Soil Taxonomy were tried.Based on the findings,it is concluded that climates between semi-humid and semi-arid once appeared in Zitong-Bazhong area(Sichuan Basin) during the Berriasian-Valanginian age,in Jinlingsi-Yangshan Basin(Liaoning Province) during the Barremian age,and in Songliao Basin(Heiliongjang Province) at the Maastrichtian age
中文关键词	白垩纪 ; 钙质古土壤 ; 土壤发生学特征 ; 古土壤分类 ; 古环境重建
英文关键词	Cretaceous period Calcareous paleosols Pedogenetic features Classification of paleosols Paleoenvironment reconstruction
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:4080973
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/225739
作者单位	1.四川大学环境科学与工程系, 成都, 四川 610065, 中国; 2.Department of GeologicalSciences, University of Oregon, OR, 97403, USA
推荐引用方式 GB/T 7714	黄成敏,王成善. 白垩纪钙质古土壤的发生学特征及古环境意义[J],2010,47(6):1029-1038.
APA	黄成敏,&王成善.(2010).白垩纪钙质古土壤的发生学特征及古环境意义.土壤学报,47(6),1029-1038.
MLA	黄成敏,et al."白垩纪钙质古土壤的发生学特征及古环境意义".土壤学报 47.6(2010):1029-1038.