The Lonar impact crater in the Deccan Traps of the Indian peninsula provides unique opportunities to study physical and chemical processes of impact cratering on basaltic targets, because terrestrial impact craters on basalts are extremely rare. Such studies are needed for determining provenance and other parameters of the excavated rocks and the cratering phenomenon that may have implications ...

Galileo and Clementine multispectral data of the Mare Tranquillitatis region have been analyzed to investigate the stratigraphy of basaltic units and the effects of lateral and vertical mixing processes within the mare. The distribution of compositionally distinct mare units is observed to be correlated with previous UV/VIS ratio images, although estimates of soil titanium contents are low in s...

Figure 1: ITE ratio plot for the Apollo 14 high-Al basalts demonstrating derivation from distinct source regions [7]. Figure 2: Rb-Sr isochron plot for 14321,1353. DERIVATION OF APOLLO 14 HIGH-AL BASALTS FROM DISTINCT SOURCE REGIONS AT DISCRETE TIMES: NEW CONSTRAINTS. C. R. Neal, C.-Y. Shih, Y. Reese, L. E. Nyquist, and G. Y. Kramer, Dept. Of Civil Eng. & Geological Sciences, University of Notr...

Introduction: Olivine vitrophyres are impact melts, consisting of Lunar highlands and KREEP-rich materials, that are primarily composed of olivines in an opaque glass, sometimes with lath-like plagioclase crystals [e.g. 0-2]. Petrographically, these are similar to vitrophyric Apollo 14 high-Al basalts [11]. The purpose of this study was to use olivine chemistry and petrographic evidence in orde...

-Ti, V, Cr, Fe, Co, Ni, Cu, and Zn have been analyzed from Sites 211,213,214,215,and 216 of DSDP Leg 22 of the Clomar Challenger in the northeastern lndian Ocean. According to these trace elements, three different types of source material are broadly defined: the basin floor basalts with a composition sirnilar to tholeiites from mid-oceanic ridges, the basalts and the differentiated rocks from ...

Widespread basaltic volcanism occurred in the region of the West Siberian Basin in central Russia during Permo-Triassic times. New 40Ar/39Ar age determinations on plagioclase grains from deep boreholes in the basin reveal that the basalts were erupted 249.4 +/- 0.5 million years ago. This is synchronous with the bulk of the Siberian Traps, erupted further east on the Siberian Platform. The age ...

Editor: T.M. Harrison Non-arc basalts of Archean and Proterozoic age have model primary magmas that exhibit mantle potential temperatures TP that increase from 1350 °C at the present to a maximum of ∼1500–1600 °C at 2.5–3.0 Ga. The overall trend of these temperatures converges smoothly to that of the present-day MORB source, supporting the interpretation that the non-arc basalts formed by the m...

Sixteen new K-Ar dates are presented from Tasmanian and Bass Basin basalts, more than doubling the previously published number. Eight volcanic regions are described, based on boundaries established on the range of the basalt types contained in each geographic region. Volcanism occurred within the span from Eocene to Miocene (47 to 13+ Ma), but mainly within the time range Middle Eocene to Early...