Journal of African Earth Sciences (and the Middle East)最新文献_第2页

A review of some neglected Karoo grabens of Uganda 对乌干达一些被忽视的卡鲁地堑的回顾

Journal of African Earth Sciences (and the Middle East) Pub Date : 1993-11-01 DOI: 10.1016/0899-5362(93)90001-7

Th. Schlueter , G. Pico-Olarker , Th. Kreuser

引用次数: 5

Geochemical evolution of Pan-African magmatic rocks from the basement complex between Okene and Lokoja, Southwestern Nigeria 尼日利亚西南部Okene - Lokoja基底杂岩泛非岩浆岩地球化学演化

Journal of African Earth Sciences (and the Middle East) Pub Date : 1993-11-01 DOI: 10.1016/0899-5362(93)90010-N

M.I. Odigi , M.C. Ezepue , A.C. Onyeagocha

引用次数: 6

Lithofacies, cyclicity, diagenesis and depositional environments of the Upper Cenomanian, El Heiz formation, Bahariya Oasis, Western Desert, Egypt 埃及西部沙漠巴哈里亚绿洲El Heiz组上塞诺曼尼亚期岩相、旋回、成岩作用及沉积环境

Journal of African Earth Sciences (and the Middle East) Pub Date : 1993-11-01 DOI: 10.1016/0899-5362(93)90011-E

M.A. Khalifa, M.M. Abu El Hasan

{"title":"Lithofacies, cyclicity, diagenesis and depositional environments of the Upper Cenomanian, El Heiz formation, Bahariya Oasis, Western Desert, Egypt","authors":"M.A. Khalifa, M.M. Abu El Hasan","doi":"10.1016/0899-5362(93)90011-E","DOIUrl":"10.1016/0899-5362(93)90011-E","url":null,"abstract":"<div><p>The Upper Cenomanian El Heiz Formation comprises seven lithofacies, four are dolostone lithofacies represented by marly dolostone (MLD), vuggy dolostone (VD), sandy dolostone (SD), and dedolostone (DD). The limestone lithofacies are mostly dolomitic marl (DML) and dolomitic echinoidal foraminiferal wakestone (DEFW). A single claystone lithofacies occurs intercalated with the above lithofacies.</p><p>Two coeval inner- and outer-shelf environments are proposed for the El Heiz Formation. The inner-shelf that extends from the central to the southern extremity of the Bahariya Oasis is characterized by cyclic sequence, each cycle consists of claystone at the base and dolostone at the top. These cycles were formed by extrinsic mechanism and described as gradual, non-gradual and truncated cycles. The outer-shelf lithofacies with cyclic limestone and claystone occur in the northeastern parts of the Bahariya Oasis. The cycles are of the gradual type, formed by auto-cyclic mechanism, representing deeper-water environment.</p><p>Two phases dolomitization can be recognized in the El Heiz Formation. Early dolomitization produced inclusion-rich dolomite at the end of cycles under intertidal zone. The second phase of dolomitization was formed by mixing marine and meteoric water, producing dolomite overgrowths rimmed on the early inclusion-rich dolomite. Dedolomitization occurs at the tops of cycles especially at the inner marking repeated subaerial exposures.</p></div>","PeriodicalId":100750,"journal":{"name":"Journal of African Earth Sciences (and the Middle East)","volume":"17 4","pages":"Pages 555-570"},"PeriodicalIF":0.0,"publicationDate":"1993-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0899-5362(93)90011-E","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53885541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Editorial: Software survey section 编辑:软件调查部分

Journal of African Earth Sciences (and the Middle East) Pub Date : 1993-11-01 DOI: 10.1016/0899-5362(93)90014-H

引用次数: 0

Effects of weathering on the infrared characteristics of Nigerian crude oils 风化对尼日利亚原油红外特性的影响

Journal of African Earth Sciences (and the Middle East) Pub Date : 1993-10-01 DOI: 10.1016/0899-5362(93)90076-3

A.A. Olajire , R.A. Oderinde

引用次数: 0

Upper cretaceous foraminiferal biostraigraphy and paleobathymetry of the Al-Baqa area, North of Amman (Jordan) 约旦安曼北部Al-Baqa地区上白垩统有孔虫生物地层与古测深

Journal of African Earth Sciences (and the Middle East) Pub Date : 1993-10-01 DOI: 10.1016/0899-5362(93)90078-5

I.A. Al-Rifaiy, O.H. Cherif, B.A. El-Bakri

引用次数: 12

Some new and rare upper cretaceous ammonites from north-eastern Nigeria 尼日利亚东北部的一些新的和罕见的上白垩纪菊石

Journal of African Earth Sciences (and the Middle East) Pub Date : 1993-10-01 DOI: 10.1016/0899-5362(93)90079-6

P.M.P. Zaborski

引用次数: 15

Sedimentological, mineralogical and geochemical studies on some recent Khors sediments, Lake Nasser, Egypt 埃及纳赛尔湖Khors沉积物的沉积学、矿物学和地球化学研究

Journal of African Earth Sciences (and the Middle East) Pub Date : 1993-10-01 DOI: 10.1016/0899-5362(93)90081-Z

Ezzat A. Ahmed , M. El-Dardir , N.N. Gindy

引用次数: 10

Editorial: Software survey section 编辑:软件调查部分

Journal of African Earth Sciences (and the Middle East) Pub Date : 1993-10-01 DOI: 10.1016/0899-5362(93)90083-3

引用次数: 0

The great inland deltas of Africa 非洲的内陆大三角洲

Journal of African Earth Sciences (and the Middle East) Pub Date : 1993-10-01 DOI: 10.1016/0899-5362(93)90073-Y

T.S. McCarthy

{"title":"The great inland deltas of Africa","authors":"T.S. McCarthy","doi":"10.1016/0899-5362(93)90073-Y","DOIUrl":"10.1016/0899-5362(93)90073-Y","url":null,"abstract":"<div><p>At least three large (> 30000 km<sup>2</sup>), low gradient alluvial fans, termed “Inland Deltas” by early travellers, are developed on the African continent. They have several features in common: (i) all occur in half-graben structures and are fault-bounded at their distal ends; (ii) they have low topographic gradients (0.2 to 0.05 m/km), and an extensive network of distributary channels on the fan surface which sustain vast wetland systems; (iii) all occur in semi-arid settings in which evapotranspiration greatly exceeds rainfall and inflow is derived from high rainfall sub-tropical areas; between 50 and 95% of inflow is lost to the atmosphere; (iv) the feeder rivers are low in suspended load and water chemistry is dominated by bicarbonate and silica; (v) they have extensive seasonal swamps, vegetated by grasses and sedges with numerous tree-covered islands, and variable areas of permanent swamp. Sedimentation is dominated by clastic accumulation in and near channels and by chemical sedimentation (calcrete and silcrete) in the seasonal swamps. Organic material is not preserved because of destruction by fire. The occurrence of these features is a result of the geomorphic influences of plate tectonics and global climatic structure.</p></div>","PeriodicalId":100750,"journal":{"name":"Journal of African Earth Sciences (and the Middle East)","volume":"17 3","pages":"Pages 275-291"},"PeriodicalIF":0.0,"publicationDate":"1993-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0899-5362(93)90073-Y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53886033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 52