標(biāo)題: Titlebook: Archaean Geochemistry; The Origin and Evolu A. Kr?ner,G. N. Hanson,A. M. Goodwin Conference proceedings 1984 Springer-Verlag Berlin Heidelb [打印本頁] 作者: Cession 時(shí)間: 2025-3-21 18:17
書目名稱Archaean Geochemistry影響因子(影響力)
作者: creditor 時(shí)間: 2025-3-21 22:10
Geochemical Characteristics of Archaean Ultramafic and Mafic Volcanic Rocks: Implications for Mantlat least for the upper mantle, was completed before 3.8 Ga ago. Moreover, a significant degree of mantle-crust and/or intra-mantle differentiation in the pre-Archaean (>3.8 Ga) is indicated by Nd and Sr isotopic data..Chondritic ratios for refractory lithophile elements (e.g. Al, Ti, Zr, Y, REE) are作者: 連接 時(shí)間: 2025-3-22 04:23
Archaean Sedimentary Rocks and Their Relation to the Composition of the Archaean Continental Crust,thought to reflect the composition of the exposed upper continental crust. In contrast, Archaean sedimentary rocks display highly variable trace element abundances, but on average have lower levels of incompatible elements (Th, LREE), lower La/Yb ratios and lack the Eu depletion characteristic of po作者: 細(xì)胞學(xué) 時(shí)間: 2025-3-22 06:39 作者: xanthelasma 時(shí)間: 2025-3-22 09:16 作者: 使苦惱 時(shí)間: 2025-3-22 16:20 作者: 花束 時(shí)間: 2025-3-22 21:08 作者: 知識(shí)分子 時(shí)間: 2025-3-23 01:17 作者: Hyperlipidemia 時(shí)間: 2025-3-23 01:47
Origin of Archaean Charnockites from Southern India,a continuous series exists from mafic to tonalite-trondhjemite end members. With the exception of K.O, major element distributions reflect the original igneous parentage of the rocks. Rb, Cs, Th, U, and Pb are depleted in charnockites although the degree of depletion does not correlate well with inf作者: Lucubrate 時(shí)間: 2025-3-23 09:23
Radiometric Ages (Rb-Sr, Sm-Nd, U-Pb) and REE Geochemistry of Archaean Granulite Gneisses from East and trace element geochemistry. A consistent age of about 2.5 Ga has been obtained by the Rb-Sr and Sm-Nd whole-rock isochron methods, in agreement with the zircon U-Pb data (Pidgeon 1980; Liu et al. 1984). Geochemical arguments from initial isotopic ratios (I. and I.) and elemental distribution pa作者: 來自于 時(shí)間: 2025-3-23 12:20 作者: 馬賽克 時(shí)間: 2025-3-23 14:52
Age and Evolution of the Early Precambrian Continental Crust of the Ukrainian Shield,hosed, mainly volcanogenic formations of basic and ultrabasic composition, intruded and reworked by tonalites and plagiogranites. Their age is 3700±200 Ma..In the composition of the Upper Archaean greenstone stage sediments play an important role along with volcanogenic rocks. The age of the metavol作者: Bronchial-Tubes 時(shí)間: 2025-3-23 20:51 作者: Cerumen 時(shí)間: 2025-3-24 00:22
the Earth‘s age has given a great impetus to the study of early Precambrian terrains. As late as the mid-sixties the Archaean still constituted the ‘terra-in- cognita‘ of earth science. High metamorphic grades, poor out- crop, and not least a widely assumed obliteration of early crustal records by 作者: Negligible 時(shí)間: 2025-3-24 04:09
The Most Ancient Rocks in the USSR Territory by U-Pb Data on Accessory Zircons,iscovery of high-grade Archaean rocks as old as 3.4 Ga within the Omolon massif of the USSR Far East and their similarity to some Aldan formations gives hope to confirm, by isotope geochronology, the existence of an Early Archaean core within the Aldan shield.作者: 絕種 時(shí)間: 2025-3-24 09:45 作者: BRUNT 時(shí)間: 2025-3-24 12:46 作者: 任命 時(shí)間: 2025-3-24 16:35
https://doi.org/10.1007/978-94-010-1769-5iscovery of high-grade Archaean rocks as old as 3.4 Ga within the Omolon massif of the USSR Far East and their similarity to some Aldan formations gives hope to confirm, by isotope geochronology, the existence of an Early Archaean core within the Aldan shield.作者: 希望 時(shí)間: 2025-3-24 19:25 作者: 接觸 時(shí)間: 2025-3-25 00:48 作者: 橡子 時(shí)間: 2025-3-25 05:54 作者: 大猩猩 時(shí)間: 2025-3-25 07:40
https://doi.org/10.1007/0-387-31099-1at least for the upper mantle, was completed before 3.8 Ga ago. Moreover, a significant degree of mantle-crust and/or intra-mantle differentiation in the pre-Archaean (>3.8 Ga) is indicated by Nd and Sr isotopic data..Chondritic ratios for refractory lithophile elements (e.g. Al, Ti, Zr, Y, REE) are作者: 軍火 時(shí)間: 2025-3-25 13:37 作者: 不知疲倦 時(shí)間: 2025-3-25 16:49
https://doi.org/10.1007/0-387-31099-1tone basin scale, parameters such as intensity of faulting, rapidity of burial, water depth and extent of irruption of komatiitic and felsic magma appear to have controlled the nature and intensity of mineralization. These inter-related parameters apparently depend on the degree of extension during 作者: Palter 時(shí)間: 2025-3-25 23:43 作者: fulcrum 時(shí)間: 2025-3-26 02:03 作者: 感染 時(shí)間: 2025-3-26 06:47
https://doi.org/10.1007/978-94-010-1769-5ition from spinel dunite, harzburgite, bronzite peridotite, pyroxenite to gabbro and gabbroic anorthosite. Relic igneous features like layering, cumulus and poikilitic textures, chromite seams with “way up” stratigraphy and occasional cryptic layering indicate an origin by a process of gravitational作者: nautical 時(shí)間: 2025-3-26 10:32
https://doi.org/10.1007/978-94-010-1769-5e traverse extends from the Peninsular Gneiss-Closepet Granite terrane in the north, through the incipient charnockite localities near Kabbaldurga and southwards into the charnockite massifs of the Biligirirangan and Andhiyur Hills..Geobarometry based on the temperature-insensitive indicator assembl作者: 迅速成長(zhǎng) 時(shí)間: 2025-3-26 16:03 作者: 有常識(shí) 時(shí)間: 2025-3-26 18:13
The Concepts of Health and Disease and trace element geochemistry. A consistent age of about 2.5 Ga has been obtained by the Rb-Sr and Sm-Nd whole-rock isochron methods, in agreement with the zircon U-Pb data (Pidgeon 1980; Liu et al. 1984). Geochemical arguments from initial isotopic ratios (I. and I.) and elemental distribution pa作者: Corroborate 時(shí)間: 2025-3-26 22:52 作者: 勉勵(lì) 時(shí)間: 2025-3-27 02:54
Evaluation and Governing in the 21st Centuryhosed, mainly volcanogenic formations of basic and ultrabasic composition, intruded and reworked by tonalites and plagiogranites. Their age is 3700±200 Ma..In the composition of the Upper Archaean greenstone stage sediments play an important role along with volcanogenic rocks. The age of the metavol作者: Keratin 時(shí)間: 2025-3-27 08:35
Evaluation and Governing in the 21st Centuryl geometry, of batholiths. Principal regional to mesoscopic-scale characteristics of xenolith swarms are outlined from the Pilbara Block (Western Australia) and southern India. Transitions along strike and across strike between stratigraphically low greenstone sequences and xenolith chains establish作者: Reclaim 時(shí)間: 2025-3-27 11:22
http://image.papertrans.cn/b/image/161164.jpg作者: 敵手 時(shí)間: 2025-3-27 15:21
https://doi.org/10.1007/978-3-642-70001-9Archean; Cambrian; chemistry; geochemistry; geoscience; isotope; mineral; petrology; research作者: 著名 時(shí)間: 2025-3-27 21:02 作者: BLANC 時(shí)間: 2025-3-27 22:59 作者: 掃興 時(shí)間: 2025-3-28 05:14
Geochemical Characteristics of Archaean Ultramafic and Mafic Volcanic Rocks: Implications for Mantlerent magma generation processes (preferred) or chemical and mineralogical stratification in the early Archaean mantle. Available Hf isotope data do not support the view that such heterogeneity in the mantle is related to core-mantle differentiation occurring ~ 4.5 Ga ago..Comparatively small-scale 作者: agonist 時(shí)間: 2025-3-28 07:37
Archaean Sedimentary Rocks and Their Relation to the Composition of the Archaean Continental Crust,dimentary data. Systematic variations of trace element patterns (e.g. REE, La/Sc, Co/Th) in Archaean sedimentary rocks provide persuasive evidence for a dominant origin from the common Archaean bimodal mafic-felsic igneous suite. On average, a 1:1 mix is indicated for the Archaean upper crust. Such 作者: CREST 時(shí)間: 2025-3-28 12:05
Spatial and Temporal Variations of Archaean Metallogenic Associations in Terms of Evolution of Granrphyry-style Mo-Cu deposits, reflect the shallow marine to subaerial environments. Younger platform-phase green-stones formed in deeper water basins and have more conventional metallogenic associations, but the volcanogenic massive sulphides, komatiite-associated Ni-Cu deposits and gold mineralizati作者: Brocas-Area 時(shí)間: 2025-3-28 17:48 作者: 個(gè)阿姨勾引你 時(shí)間: 2025-3-28 19:45 作者: 暗語 時(shí)間: 2025-3-28 23:09
Petrology and Geochemistry of Layered Ultramafic to Mafic Complexes from the Archaean Craton of Kared to chondrites and LREE/HREE ratios of 1–3. The patterns display weak positive Eu anomalies.The Ce./Yb. ratios correspond closely to those of Archaean layered anorthositic gabbros from Canada and West Greenlad. The late gabbros exhibit fractionated REE patterns enriched by a factor of about 40 com作者: 違反 時(shí)間: 2025-3-29 03:28
Pressures, Temperatures and Metamorphic Fluids Across an Unbroken Amphibolite Facies to Granulite Ferature in the transition zone is 750°C, determined from garnet-pyroxene Fe/Mg distributions. The quality of the geothermometry is not sufficient to establish with certainty a temperature increase southward over the transition zone..A reconnaissance profiling of the K/Rb whole rock ratios of harnock作者: ineptitude 時(shí)間: 2025-3-29 07:43
Origin of Archaean Charnockites from Southern India,ence, trace element distributions do not generally correlate with metamorphic grade..Geochemical modelling indicates that hornblende and/or garnet fractionation, and in some cases plagioclase fractionation, were important in the formation of the charnockite protoliths. The sparsity of mafic cumulate作者: FEIGN 時(shí)間: 2025-3-29 14:18
Radiometric Ages (Rb-Sr, Sm-Nd, U-Pb) and REE Geochemistry of Archaean Granulite Gneisses from Eastd Wu 1981) or Chungtiao Movement (Huang 1978)..The granulites of the Qianxi Group have diverse compositions ranging from ultrabasic through basic-intermediate to acid. Discriminant function calculations suggest that most analyzed samples have an igneous parentage. Only a few show characteristics of 作者: 表示問 時(shí)間: 2025-3-29 16:59 作者: cartilage 時(shí)間: 2025-3-29 19:54
nter-related factors: (1) advances in isotopic methods and their application to Precambrian rocks, and (2) the recognition that some of the oldest terrains have retained a wealth of primary igneous and sedi- mentary textures and even geochemical characteristics.978-3-642-70003-3978-3-642-70001-9作者: 整理 時(shí)間: 2025-3-30 02:27 作者: cacophony 時(shí)間: 2025-3-30 05:31
https://doi.org/10.1007/0-387-31099-1erent magma generation processes (preferred) or chemical and mineralogical stratification in the early Archaean mantle. Available Hf isotope data do not support the view that such heterogeneity in the mantle is related to core-mantle differentiation occurring ~ 4.5 Ga ago..Comparatively small-scale 作者: 相符 時(shí)間: 2025-3-30 11:04
Multi-Dimensional Preference Models,dimentary data. Systematic variations of trace element patterns (e.g. REE, La/Sc, Co/Th) in Archaean sedimentary rocks provide persuasive evidence for a dominant origin from the common Archaean bimodal mafic-felsic igneous suite. On average, a 1:1 mix is indicated for the Archaean upper crust. Such
