Study of the concentration and isotopic composition of strontium and rubidium in hornblende diorite dikes and sills of Precambrian age from the Panamint Mountains of California showed that these rock systems were enriched in radiogenic Sr during a late Mesozoic metamorphism. Enrichments in radiogenic Sr were observed for total-rock samples which yielded apparent ages of up to 34,000 m.y., altho...

The Lewisian complex of northwest (NW) Scotland has long been correlated with intercontinental Palaeoproterozoic belts of the North Atlantic region but uncertainty about the age and origin of the supracrustal rocks of the Loch Maree Group (LMG) and the apparent lack of subduction-related intrusive rocks have precluded interpretations of a similar tectonic setting for the Lewisian. We present in...

The assessment of pile drivability is the premise successful installation, and completely weathered (CW) rock may bring risk refusal. This paper presents a case driving refusal that occurred in CW gneiss layer. physical mechanical properties are analyzed based on results laboratory test, cone penetration test (CPT), standard (SPT). By comparing with those from intact gneiss, layer this study wa...

In this paper, the influence of coarse aggregate on slump flow and following mechanical strengths (flexural compressive strengths), shrinkage rate, chloride penetration resistance, freeze–thaw resistance were investigated. Water–binder ratios in study 0.22, 0.30, 0.34, 0.45. Sand ratio was All samples cured for 7 d, 14 28 56 respectively. Results indicated that fluidity cement concrete with dif...

Groundwater exploitation requires better understanding of the resource availability and quality/vulnerability. Geophysical techniques, pumping test, hydraulic measurement, borehole logging quality test analysis have been used in Ibulesoro, southwestern Nigeria, to hydrogeological system terms groundwater availability, aquifer delineation, evaluate physico-chemical biological contents. The study...

a School of Earth Sciences, Bristol Isotope Group, University of Bristol, Wills Memorial Building, Queen’s Road, Bristol BS8 1RJ, United Kingdom b School of Earth, Atmospheric and Environmental Sciences, Isotope Geochemistry & Cosmochemistry Group, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom c Department of Geological Sciences, NASA Lunar Science Institute Center f...