Results 71 to 80 of about 5,193 (249)

Genesis of crystalline crust and lithosphere of ancient platforms according to data on the hot heterogeneous accretion of the Earth

Литосфера, 2017
Compositions of gneisses from the Early Precambrian crystalline complexes of the Aldan shield and of mantle xenoliths from kimberlites plot along the magmatic fractionation trends.
Vladimir S. Shkodzinskii
doaj   +2 more sources

GRANITES OF THE NORTHERN TIMAN – PROBABLE INDICATORS OF NEOPROTEROZOIC STAGES OF RODINIA BREAKUP

Геодинамика и тектонофизика, 2020
The Northern Timan is an uplifted block of Late Precambrian basement of the Timan Ridge, where Neoproterozoic sedimentary-metamorphic rocks of the Barmin Group are cut by intrusive rocks of different composition and all unconformably overlain by Lower ...
V. L. Andreichev, A. A. Soboleva, O. V. Udoratina, Yu. L. Ronkin, M. A. Coble, E. L. Miller   +5 more
doaj   +1 more source

Provenance of Upper Precambrian-Lower Cambrian shales in the Central Iberian Zone, Spain: evidence from a chemical and isotopic study

, 1997
Geochemical and isotopic (Sr, Nd, O) data are presented for Upper Precambrian and Lower Cambrian shale sequences from the Central Iberian Zone, Spain, in order to define geochemical discriminants between them, and to assess the nature of the source ...
M.I. Valladares, Fallick, A.E., Stephens, E.E., A.E. Fallick, Rogers, G., J.M. Ugidos, G. Rogers, Valladares, M.I., C. Recio, Recio, C., Ugidos, J.M., W.E. Stephens   +11 more
core   +2 more sources

Ductile Extrusion Triggered by Continental Collision in NE Brazil

Terra Nova, EarlyView.
ABSTRACT The Borborema Province in northeastern Brazil hosts one of the world's largest strike‐slip shear zone networks, active during the late Neoproterozoic assembly of West Gondwana. Whether these shear zones initiated during active continental collision or as a post‐orogenic response to far‐field stresses remains debated.
L. R. Tesser, C. E. Ganade, C. R. Cioffi, J. B. Forshaw, M. Hueck, E. Celis, M. A. S. Basei   +6 more
wiley   +1 more source

Seismic Reflection Profiling Reveals New Accretionary Structure in the Solonker Zone of the Central Asian Orogenic Belt

Geophysical Research Letters
The Central Asian Orogenic Belt (CAOB) was formed by the aggregation and collage of numerous Paleozoic subduction‐accretion assemblages and Precambrian microcontinental blocks.
Xiao‐Miao Tan, Jian‐Bo Zhou, Hui‐Lin Li, Hai‐Yan Wang, He‐Sheng Hou, Wen‐Hui Li, Ying Rao, Rui Gao   +7 more
doaj   +1 more source

Early oil charging from Sinian shales in Ordovician carbonates of the Tabei Uplift, Tarim Basin: Evidence from biomarkers

Petroleum Research
Despite over 40 years of exploration focusing on the deep to ultra-deep Ordovician carbonates as major hydrocarbon targets in the Tarim Basin, the identification of their source rocks remains elusive.
Qingxiu Zeng, Peng Sun, Xingchao Jiang, Heng Zhang, Qifei Fang, Lei Jiang   +5 more
doaj   +1 more source

Potential and favorable areas of petroleum exploration of ultra-deep marine strata more than 8000 m deep in the Tarim Basin, Northwest China

Journal of Natural Gas Geoscience, 2018
At present, deep and ultra-deep oil and gas have become the research and exploration hotspots. With little drilling data available, the geological understanding on deep formations is still in the exploratory stage, but most petroleum geologists have ...
Guangyou Zhu, Yinghui Cao, Lei Yan, Haijun Yang, Chonghao Sun, Zhiyao Zhang, Tingting Li, Yongquan Chen   +7 more
doaj   +1 more source

A carbonate-banded iron formation transition in the Early Protorezoicum of South Africa [PDF]

, 1992
Seven new and two resurveyed stratigraphic sections through the important carbonate-BIF transition in Griqualand West are presented and compared with six published sections.
Lamprecht, W., Altermann, Wladyslaw, Horstmann, U. E., Hälbich, Ingo W.   +3 more
core   +1 more source

Low Water Content of the Lower Continental Crust Induced by Decompression Melting: Evidence From the Weichang Granulite Xenoliths in the Northern North China Craton

Geochemistry, Geophysics, Geosystems
The water content of granulite xenoliths from the Cenozoic Weichang basalts in the northern North China Craton (NCC) is investigated to constrain the nature and evolution of the lower crust.
Yuanyuan Liu, Dongya Zou, Xiaoyan Gu, Yantao Hao, Hongfu Zhang, Shenghua Zhou   +5 more
doaj   +1 more source

DEBRIS SOURCE AREA EVOLUTION DURING FORMATION OF THE URALIAN FOREDEEP AT THE SAKMARIAN STAGE OF THE EARLY PERMIAN ACCORDING TO U-Pb LA-ICP-MS ISOTOPE DATING OF DETRITAL ZIRCONS

Геодинамика и тектонофизика
The article presents the results of studying the sources of terrigenous material deposition in the Uralian foredeep according to U-Pb dating of detrital zircons from terrigenous rocks of four stratigraphic levels of the Kapysov formation (Sakmarian stage)
E. A. Volodina, A. V. Tevelev, A. A. Borisenko, E. V. Koptev, A. S. Novikova, А. S. Dubenskiy, K. G. Erofeeva   +6 more
doaj   +1 more source