[PDF] Top 20 Directory UMM :Data Elmu:jurnal:P:Precambrian Research:Vol105.Issue2-4.2001:

... Advanced Research Workshop in Bergen on the geochemical consequences of the move- ments of fluids in the Earth’s crust, and that gave rise to a noteworthy book ‘‘Fluid Move- ments – Element transport and the ... Lihat dokumen lengkap

... seismic data from the Polar Profile, may be interpreted to image a trans-crustal structure — possibly a fossilised subduction zone — supporting an arc origin for the protoliths of the Lapland Granulite, UGT and ... Lihat dokumen lengkap

... While low-temperature, diagenetically grown ti- tanites have been known for many decades, recent mineralogical and isotopic studies (e.g. Gromet, 1991; Resor et al., 1996) have particularly empha- sized the growth of ... Lihat dokumen lengkap

... The Outer Hebridean Lewisian has not at- tracted the same intensive geochemical and geochronological investigations that have been carried out on the mainland over the past three decades, although there is a wealth of ... Lihat dokumen lengkap

... The porphyritic charnockite sample which was used for zircon separation (sample 101249 in Table 1) plots together with the most mafic part of charnockite series, and was distinguished on all the diagrams. It is ... Lihat dokumen lengkap

... The Kolvitsa Belt in the south-western Kola Peninsula formed coeval with the earliest Palaeoproterozoic rift-belts in the Fennoscandian Shield. The Palaeoproterozoic history of this belt comprises the deposition of the ... Lihat dokumen lengkap

... along Kaipokok Bay, marks another major change in depositional character, with U – Pb data constraining deposition to after 2013 Ma, the age of the youngest detrital zircon. This is a remark- able result because ... Lihat dokumen lengkap

... What data have been presented are often derived from destructive analyses of fluid inclusions (for exam- ple, see Table 5 in Roedder, 1972), but are ...quantitative data set for fluids accompanying the ... Lihat dokumen lengkap

... Pb-isotope data from the Al Bayda arc terrane is that these display highly unradiogenic compositions, plotting below the Stacey and Kramers (1975) terrestrial Pb isotope growth curve and to the left of the fields ... Lihat dokumen lengkap

... tios of analyses selected as being of the least isotopically disturbed sites (close to concordant Pb/U dates), with very small non-radiogenic com- ponent to Pb in grains belonging to the same population/type (e.g. for ... Lihat dokumen lengkap

... More detailed supporting evidence for this sedi- ment source model comes from the zircon study of Whitehouse et al. (1997). Zircons from a semipelitic schist sample (Flowerdale schist) yielded a range of ages that fall ... Lihat dokumen lengkap

... There are two extreme viewpoints regarding the development of the continental crust throughout the history of the Earth. The first is that its volume grew by incremental extraction from the mantle, with return flux ... Lihat dokumen lengkap

... U – Pb study of a sample of metasedimentary rock from the Ukaleq gneiss complex found 2750 – 2900 Ma zircons of probable detrital origin and that two or more generations of 2700 – 2500 Ma metamorphic zircons are present. ... Lihat dokumen lengkap

... The Isua greenstone belt (Fig. 1) contains the oldest known, relatively well preserved, metavolcanic and metasedimentary rocks on Earth. The rocks are all deformed and many were substantially altered by metasomatism, but ... Lihat dokumen lengkap

... REE data that garnet was not involved in the crystal frac- tionation assemblage, as even small amounts would strongly deplete the heavy rare earth con- centrations of the most evolved ... Lihat dokumen lengkap

... and P, apparently derived from a strongly enriched, probably veined, mantle reservoir, have been found within the Sisimiut charnockite complex further west in the Nagssugtoqidian orogen ... Lihat dokumen lengkap

... values; (2) low concentrations of heavy metals; (3) positive Eu anomalies; (4) low Co/Zn and Ni/Zn values. The Gorge Creek Group cherts show mi- crostructures produced by primary precipitation of amorphous silica ... Lihat dokumen lengkap

... Our data could be intrepreted as supporting the existence of a shallow-level inversion event that postdates sedimentation and lithification but predates dome formation, in the range 3400 – 3320 ... Lihat dokumen lengkap

... These data fall in the same age range as U – Pb columbite – tantalite 1807 – 1803 Ma ages for late-kinematic pegmatites in southern Finland, which intruded during trans- pressive, semi-ductile conditions (Lindroos ... Lihat dokumen lengkap

... The final stages of Mesoproterozoic magmatism in the Mount Isa Inlier is represented by the Williams and Naraku batholiths within the Clon- curry district (Fig. 1). These batholiths were pro- duced during two periods ( ... Lihat dokumen lengkap