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Showing 1 to 6 of 6 for “"BASIC ROCKS"”.
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The petrogenesis and geochemistry of the dioritic complexes south of Balmoral forest, Angus
… are common in the intermediate rock types. The basic rocks are cumulates which display wall-parallel layering. Mineralogical variation displays a transition from pyroxene-dominated anhydrous assemblages to amphibole-dominated assemblages. The diorites by contrast display floor-parallel layering …
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Tertiary and carboniferous magmatism around Lundy Island and the outer Bristol Channel - a geophysical and geochemical perspective
… crust, rather than in one large magma chamber. Basic dykes at Lee Bay (60 ± 0.6 to 63.1 ± 0.7 Ma) pre-date the Lundy Dyke Swarm and were derived from a discrete magma chamber, possibly near to Morte Point. Conversely, other dykes in North Devon (Fremington dyke - 292.4 ± 1.7 Ma; Horse-Shoe Rocks …
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Soils and soil clay mineral formation in the Virginia Blue Ridge and Piedmont provinces
… and petrographic examinations of the parent rocks reveal that even after prolonged chemical weathering, physical and mineralogical differences exist between soil types which are due largely to changes in the parent rock, and to a lesser extent changes in the topography. Soils developed from …
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Blueschists and associated rocks in the south Sepik region, Papua New Guinea; field relations, petrology, mineralogy, metamorphism and tectonic setting
… and ophiolite fragments and other volcanogenic rocks, related to the arc to the north. Near the Tau body, the Salumei Formation is metamorphosed from prehnite-pumpellyite to low-greenschist grade. Stratigraphic constraints and isotopic dating indicate an Oligocene to early Miocene metamorphism …
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New Experimental Data for a Re-Calibration of the Fe-Ti Oxide Thermo-Oxybarometers
… are important accessory minerals in igneous rocks. They are major carriers of rock magnetism and petrologic indicators of temperature and redox conditions during the magmatic stage (Buddington & Lindsley, 1964). The titanomagnetite-ilmenitess (Tmt-Ilmss) thermo-oxybarometer has been widely …
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ΜΕΛΕΤΗ ΤΗΣ ΟΡΥΚΤΟΛΟΓΙΑΣ, ΠΕΤΡΟΛΟΓΙΑΣ, ΓΕΩΧΗΜΕΙΑΣ ΚΑΙ ΤΩΝ ΦΑΙΝΟΜΕΝΩΝ ΜΕΤΑΜΟΡΦΩΣΕΩΣ ΒΑΣΙΚΩΝ ΚΑΙ ΥΠΕΡΒΑΣΙΚΩΝ ΠΕΤΡΩΜΑΤΩΝ ΤΗΣ ΠΕΡΙΡΟΔΟΠΙΚΗΣ ΖΩΝΗΣ ΣΤΗΝ ΠΕΡΙΟΧΗ ΤΗΣ ΘΡΑΚΗΣ
… SAMPLES FROM ALL THE PETROLOGICAL TYPES OF THE BASIC AND ULTRABASIC ROCKS OF THE CIRCUM-RHODOPE BELT IN THE AREA OF THRACE PERMITTED SAME IMPICATIONS RELATED TO THEIR PETROGENESIS. THUS, THE GEOTECTONIC SETTING WAS A SYSTEM OF ISLAND ARE-MARGINAL BASIN. THE PRIMARY MAGMAS OF THE PROTOLITHS …