[PDF] Top 20 Directory UMM :Data Elmu:jurnal:P:Precambrian Research:Vol101.Issue1.2000:

... The data outlined below also argue against ensialic rifting of a stable Ar- chaean craton, and are consistent with a post-col- lisional setting for the felsic ...zircon data and whole- rock geochemical ... Lihat dokumen lengkap

... new data collected dur- ing three field seasons (1997 – 1999), the purpose of this letter is to (1) re-examine the stratigraphic setting; (2) critically evaluate whether or not coarse detrital sediments occur ... Lihat dokumen lengkap

... The Loraboue´ Birimian ultramafic-mafic assemblage, located in the Boromo greenstone belt (Burkina Faso), is interpreted as the remains of a magma chamber that crystallized at the base of an island arc. The ultramafic ... Lihat dokumen lengkap

... sedimentological data imply that the Braemar ironstones accumulated in a basin along the border of a continental glaciated high- land to the northeast and a low-lying weathered landmass to the ... Lihat dokumen lengkap

... Density currents fed directly from subaqueous eruptions can be divided conceptually into three groups based on modes of fragmentation and transport: (I) explosive fragmentation, with deposition from a gas-supported ... Lihat dokumen lengkap

... HREE. Precambrian weathering of basaltic rocks (Kimberley and Grandstaff, 1986) results in Na depletion, variable behaviour of the heavier alkalies (K,Rb, Cs) and the alkaline earths (Ca, ...of Precambrian ... Lihat dokumen lengkap

... (Pretorius, 1976) that extends for about 750 km along a north-east axis from Sodium in the Brit- stown District of the Northern Cape Province to Derdepoort in the Northwestern Province with a width of 350 km at its ... Lihat dokumen lengkap

... in Precambrian Research represents a direct outgrowth of a special session ‘‘Processes in physical volcanology and volcani- clastic sedimentation: modern and ancient’’ at the meeting of the Geological (GAC) ... Lihat dokumen lengkap

... Textural relations, such as plagioclase partial resorption, blue-amphibole acicular inclusions in oligoclase, microgranular agglomerations, and re- verse zoning in amphibole are evidence that a simple magmatic history is ... Lihat dokumen lengkap

... The Bobby Cove Formation of the Snooks Arm Group, north-central Newfoundland, displays cycles of lava- and sediment-dominated successions. The formation, located between pillow basalts and black graptolite-bearing mud- ... Lihat dokumen lengkap

... The nPCMs, together with the Mawson Coast and the Rayner Complex, separate Prydz and Lu¨tzow-Holm Bays (Fig. 1c). With the recogni- tion of high-grade Palaeozoic tectonism within these terrains, the nPCMs has received ... Lihat dokumen lengkap

... The uppermost section of the Hunter Mine group (HMG) (2728 Ma), a bimodal volcanic complex in the Abitibi greenstone belt, contains both oxide and carbonate facies banded iron-formation (BIF). This paper explores the ... Lihat dokumen lengkap

... The majority of volcanogenic massive sulphide deposits (VMS) in the geologic record are associ- ated with rhyolitic rocks (Rona, 1988; Barrie and Hannington, 1997), whereas modern VMS coun- terparts are observed mainly ... Lihat dokumen lengkap

... inferred 2000 m-high, back-arc Tok Island volcano, Korea, which represents a subaqueous effusive episode before the onset of explosive shallow-water to emergent volcanism (Sohn, ... Lihat dokumen lengkap

... The Balsum Bud Cove Formation of the Snooks Arm Group in the eastern Baie Verte Peninsula, Newfoundland was deposited as part of the cover rocks of the Betts Cove Ophiolite which was one of a collage (temporally fourth ... Lihat dokumen lengkap

... Recognition of pyroclastic debris in extensively deformed and altered modern and ancient rocks is difficult because delicate volcanic textures and sedimentary bedforms are destroyed. Pumice shreds, vitric shards, broken ... Lihat dokumen lengkap

... the Precambrian, torrential rainfall due to disturbances of the weather patterns from volcanic eruptions would easily have reworked volcaniclastic debris in the Hekpoort palaeoenvi- ronment; under such conditions, ... Lihat dokumen lengkap

... Two sparsely plagioclase-phyric rhyolite domes, 50 – 100 m thick and 125 – 250 m long as observed in 2-dimensional, vertically dipping exposures, are partly mantled by a rhyolite volcaniclastic complex that, on the south ... Lihat dokumen lengkap

... 37 is the cost of any pathpcw connecting w and travelled by users at equilibrium, we have that the average user satisfactionScan be written as follows: S‰fc x†;xŠ ˆ 1 so that the optim[r] ... Lihat dokumen lengkap

... The Multinomial Probit (MNP) formulation provides a very general framework to allow for inter- dependent alternatives in discrete choice analysis. Up until recently, its use was rather limited, mainly because of the ... Lihat dokumen lengkap