A review and interpretation of the geologic setting of the Watchung Basalt flows, New Jersey. For example: (1) mid-ocean ridge basalts (MORB) and oceanic island basalts (OIB) have clearly distinguishable trace element and Sr-Nd isotope geochemical characteristics; (2) arc related basalts, including IOAB (intra-oceanic arc basalts), IAB (island arc basalts) and CAB (continental arc basalts), exhibit following distinguishing features: all are characterized by low Nb/La ratios (<0.85) and negative Nb, Ta and Ti anomalies; most exhibit low Nb concentrations (<8 ppm), high positive ɛNd values and low enrichment of incompatible elements except the continental arc shoshonitic basalts that possess high concentrations of incompatible trace elements and lower to negative ɛNd values; (3) although contamination by continental crust or lithosphere can impart subduction-like signature (e.g., low Nb, low Ta and low Ti) and lead to misidentification of contaminated continental intraplate basalts as arc related, there are still some essential differences between continental intraplate basalts and arc related ones; such as: uncontaminated continental intraplate basalts have high Nb concentrations, Nb/La > 1, “hump-shaped” OIB-like trace element patterns and moderate positive ɛNd values that distinguish them from the arc related ones; whereas, the contaminated continental intraplate basalts are characterized by pronounced negative Nb, Ta and Ti anomalies, but their concentrations of incompatible trace elements are conspicuously higher than those of subduction-zone basalts that also distinguishes them from the arc related ones; (4) an important difference between back-arc basin basalts (BABB) and the MORB is that the former exhibit both MORB-like and arc-like geochemical characteristics; (5) most oceanic plateau basalts (OPB) show diagnostic geochemical characteristics of enriched MORB (E-MORB) to transitional MORB (T-MORB); only the Kerguelen Plateau is an exception; the early (pre 90 Ma) volcanism of the Kerguelen Plateau is associated with the Early Cretaceous break-up of Gondwana and displays features of continental flood basaltic volcanism; with time, the tectonic setting of the Kerguelen plume-derived volcanism changed from a rifted continental margin setting (133–118 Ma) through a young, widening ocean (118–40 Ma), finally to an oceanic intraplate setting (~40 Ma to the present). A flood basalt is the result of a giant volcanic eruption or series of eruptions that covers large stretches of land or the ocean floor with basalt lava.Many flood basalts have been attributed to the onset of a hotspot reaching the surface of the earth via a mantle plume. His research interests include petrology, geology of ore deposits and geological evolution of orogenic belts. The fact that none of these effects are unique to a specific tectonic setting illustrates the fundamental logical error in the formulation of discrete tectonomagmatic classifications of basalts using empirical discrimination diagrams. 1773 Tectonic setting of outer trench slope volcanism: pillow basalt and limestone in the Taconian orogen of eastern New York Ed Landing, Georgia Pe-Piper, William S.F. ... Continental Flood Basalt Provinces such as the Columbia River Plateau, USA, the Parana in Brazil and the Deccan Traps of India are characterized by huge volumes of tholeiitic basalt erupted over a short period of time. Ocean island basalt (OIB) is a volcanic rock, usually basaltic in composition, erupted in oceans away from tectonic plate boundaries. Geochemical characteristics and geotectonic setting of early Ordovician basalt lavas in the Ballantrae Complex ophiolite, SW Scotland - Volume 91 Issue 3-4 Skip to main content Accessibility help We use cookies to distinguish you from other users and to provide you with a better experience on our websites. by Karen B. Roberts, University of Delaware. It is a problem of great interest to igneous petrologists to recover the original tectonic setting of mafic rocks of the past. Recently his research interests have been mainly in regional volcanism and Large Igneous Province. Activity 5.8 Tectonic Setting of Some Major Volcanic Rock Types Name: Course/Selection: Date: Learning GOAL You will discover how different magma types might be related to tectonic setting, given information about active volcanoes in the United States and the adjacent seafloor A Color each of the white circles in Fig. See more. The olivine in basalt records much information about formation and evolution of basaltic magma, which may help to discriminate basalt tectonic settings. Google Scholar. Full sample location and analyti-cal data have been archived in the PeTlAB Geoanalytical ... Basalt pillow lava with white zeolite-rich veins, 2 km north of "B13 creek". From Winter (2001) An Introduction to Igneous and Metamorphic Petrology. ... Volcanic and tectonic setting of the Guadalajara region. metamorphism [Pirajno, 1980; ... active margin magmatism has hitherto been evidenced and this has been taken as an evidence for a purely extensional tectonic setting. Establishing the timing of lithospheric extension, continental rifting, and the onset of continental flood basalt volcanism is therefore of importance to petrogenetic models. Basalt, an extrusive volcanic rock, is dark and heavy (specific gravity 3.3), and generally forms the relatively low-elevation crust beneath the ocean basins. To learn more about plate tectonics, geologists study the … (2005). It has a composition similar to gabbro. Figure 10-13b. 2.4. Compared to the familiar granite of the continents, basalt ("ba-SALT") is darker, denser and finer grained. Xiangmin Li is a Professor of Geological Sciences at Xi'an Research Institute of Geology and Mineral Resources, China Geological Survey (CGS), where he has been since 1986. However, the viewpoint that olivine is connected with the tectonic setting where it formed is controversial. Basalt geochemistry can be used as a diagnostic indicator for determining the tectonic setting of origin, because specific plate tectonic settings often impart distinctive geochemical characteristics. Study of olivine provides new data set for understanding plate tectonics. Basalt contains minute magnetic minerals that take on the direction of the Earth’s magnetic field at the time of eruption. massive basalt flows on the continent, unknown tectonic setting, Basalt plateau: Columnar joints: Partial melting: Fractional crystallization: as magma cools some things crystallize and settle out, resulting magma more felsic Pressure melting: Geothermal gradient: Sedimentary rocks: Chapter 6 Basalt plateau: Columnar joints: Partial melting: Fractional Basalts from the College of Changchun geology in 1986, and volcanic.. Process comes from the magnetic properties of the past rock sampling indicate that different tectonic setting of the world oceanic! 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