搜索结果: 1-14 共查到“理学 Precambrian”相关记录14条 . 查询时间(0.057 秒)
中国地质大学科学技术发展院陈中强* 等 BGEG国家重点实验室. Earth-Science Reviews (2019), Biosedimentological features of major microbe-metazoan transitions (MMTs) from Precambrian to Cenozoic
地史时期；生物沉积；后生生物；微生物；过渡期
2021/10/20
近日，中国地质大学生物地质与环境地质国家重点实验室陈中强教授团队题为《从前寒武纪到新生代主要的微生物-后生动物过渡期的生物沉积特征》（Biosedimentological features of major microbe-metazoan transitions (MMTs) from Precambrian to Cenozoic）的学术论文在地学《Earth-Science Reviews...
Multiple Dolomitization and Fluid Flow Events in the Precambrian Dengying Formation of Sichuan Basin, Southwestern China
Precambrian dolomite geological fluid flow meteoric water hydrothermal activity Sichuan Basin
2018/4/10
The Precambrian Dengying Formation is a set of large-scale, extensively dolomitized, carbonate reservoirs occurring within the Sichuan Basin. Petrographic and geochemical studies reveal dolomitization...
Life in the Precambrian may have been much livelier than previously thought
Life in the Precambrian previously thought
2017/7/20
The Garden of the Ediacaran was a period in the ancient past when Earth’s shallow seas were populated with a bewildering variety of enigmatic, soft-bodied creatures. Scientists have pictured it as a t...
VLF-EM and VES: an application to groundwater exploration in a Precambrian basement terrain SW Nigeria
Electromagnetic (VLF-EM) Hard rock environment Groundwater development Layer resistivity Bed thickness mappingss mapping
2015/8/17
In a hard rock environment with surface or near surface expression of outcrops, the use of VES only becomes difficult due to its associated problems and limitations. However, the use of VLF-EM becomes...
Banded Iron Formations (BIFs) and Associated Sediments Do Not Reflect the Physical and Chemical Properties of Early Precambrian Seas
Early Precambrian BIF Non-Marine Polar Regions
2013/3/7
Ring-in-ring structures in Australian Early Precambrian banded iron formation (BIF) were identified as bubbling mud wavelets, which lithified during temporary exposure, contradicting the alleged BIF d...
Structural Evolution of a Precambrian Segment: Example of the Paleoproterozoic Formations of the Mako Belt (Eastern Senegal, West Africa)
Kedougou Kenieba Inlier Paleoproterozoic Transpression
2013/3/7
The western part of the Kedougou Kenieba Inlier is located in the West African Craton. It consists of paleoproterozoic NE-trending elongate belts (subprovinces) of metavolcanic and granitic rocks that...
Abiogenic,microbial and hybrid authigenic crusts:components of Precambrian stromatolites
Archaean carbonate microbial Proterozoic stromatolite thrombolite
2009/12/7
Authigenic seafloor carbonate crusts include fenestrate microbialite, thrombolite, and four types here designated Fine-grained Crust, Sparry Crust, Hybrid Sparry Fine-grained Crust, and Sparry Crust p...
Electromagnetic Profiling for Groundwater in Precambrian Basement Complex Areas of Nigeria
Electromagnetic Profiling Groundwater Precambrian Basement Complex Areas
2009/10/26
Ground electromagnetic profiling, using a Geonics EM34-3 instrument, has
been employed to identify areas of high conductivity in a Precambrian basement
complex terrain of Nigeria.Field examples, con...
A Paleointensity Method to study the Cause of Reversal Asymmetry in Late Precambrian Keweenawan Rocks
Paleointensity Cause Asymmetry Precambrian Keweenawan Rocks
2009/6/15
A Paleointensity Method to study the Cause of Reversal Asymmetry in Late Precambrian Keweenawan Rocks.
Multiple Episodes of Clay Alteration at the Precambrian/Paleozoic Unconformity, Appalachian Basin: Isotopic Evidence for Long-Distance and Local Fluid Migrations
Alteration Brines Chlorite Illite Isotopes Meteoric Water Precambrian Unconformity Ontario
2011/12/6
Abstract: Chlorite and illite are commonly associated with ubiquitous secondary K-rich feldspar in the rocks located immediately above and below the Precambrian-Paleozoic unconformity in southwestern ...
“Retrograde Diagenesis” of Clay Minerals in the Precambrian Freda Sandstone, Wisconsin
Analytical Electron Microscopy Chlorite Freda Formation Illite I-S Muscovite Retrograde Diagenesis Scanning Electron Microscopy Smectite Transmission Electron Microscopy
2011/12/6
Abstract: Siltstones from the Precambrian Freda Formation in Wisconsin have been studied by scanning, scanning-transmission and analytical electron microscopy (SEM, STEM and AEM), and X-ray diffractio...
Hematite and Goethite from Duricrusts Developed by Lateritic Chemical Weathering of Precambrian Banded Iron Formations, Minas Gerais, Brazil
Hematite Goethite Laterite Mossbauer Spectrometry
2011/12/1
Abstract: The upper 15–20 m of a 200 m thick lateritic weathering profile on Precambrian itabirites of Capanema, Brazil, reveals a genetic pathway for the formation of hematitic and goethitic nodules ...
Preservation of Clay Minerals in the Precambrian (1.1 Ga) Nonesuch Formation in the Vicinity of the White Pine Copper Mine, Michigan
Chlorite Diagenesis Illite Mixed-layer illite/smectite Nonesuch Formation White mica
2011/12/28
The Middle Proterozoic (1.1 Ga) Nonesuch Formation, host of the stratiform copper deposit at White Pine, Michigan, consists of 200 m of principally dark grey clastic sediments which contain detritus o...
Scanning Electron Microscopy of Quartz in Precambrian Cherts and Dolomites from Southern Africa
Chert Crystallization Dolomite Morphology Metamorphism Quartz
2012/2/10
Scanning electron microscopic (SEM) examination of the quartz isolated from chert of Transvaal and Swaziland, of 2000 and 3400 million year (MY) ages, respectively, in southern Africa revealed marked ...