Directory UMM :Data Elmu:jurnal:P:Precambrian Research:Vol102.Issue3-4.2000:
Teks penuh
Gambar
Dokumen terkait
The ages of the high pressure granulite peak- metamorphism in eastern Tanzania can be con- strained to an interval from 655 to 615 Ma and varies significantly in the five
After a summary of our present knowledge of the Archaean evolution of the Caraja´s Mineral Province, we shall (i) describe the mineralogy, chemistry and structure of the Mara-
The basin-fill cycle is com- posed of six tectonosequences, from bottom to top (Figs. 3 and 4), the Olaria tectonosequence (prerift stage), the Natureza, Sa˜o Joa˜o da Chapada
the Neoproterozoic sedimentary rocks seem to contain rare zircons of pre-Mesoproterozoic age relative to zircons of Grenvillian and Early Cado- mian age (Table 1, Fig. This may
On the basis of Nb / Y (an index of alkalinity of volcanic rocks), the two groups of mafic amphibo- lites in the study area are clearly distinguished. Group 1 samples are
To test this hypothesis, we carried out a geochemical and isotopic (Nd, Pb and O) study of granitoids and associated metasedimentary rocks and basement gneisses from the southern
The protoliths of the Dabieshan orthogneisses are diverse, and three types of rocks are distinguished: (1) the majority of the felsic gneisses in the eclogite units display
We shall focus on Eastern Europe companies for which the pretenders are generally foreign companies. Their objectives can often be to extract private benefits to the detriment
