Lithospheric thinning beneath the Tengchong volcanic field, Southern China: Insight from Cenozoic calc-alkaline basalts

Lithospheric thinning beneath rifted regions of Southern California.

The stretching and break-up of tectonic plates by rifting control the evolution of continents and oceans, but the processes by which lithosphere deforms and accommodates strain during rifting remain enigmatic. Using scattering of teleseismic shear waves beneath rifted zones and adjacent areas in Southern California, we resolve the lithosphere-asthenosphere boundary and lithospheric thickness va...

Significance of hornblende in calc-alkaline andesites and basalts

Hornblende occurs in some andesitic and basaltic rocks of calc-alkaline affini1y, where it is commonly associated with olivine. The texture, eruption history, and composition are interpreted to indicate that hornblende commonly forms as a product of reaction between olivine and basaltic and andesitic liquids. The natural hornblendes probably formed within the crust at temperatures between 960o ...

Seismic structure of the Tengchong volcanic area southwest China from local earthquake tomography

Distribution and geochemical variations among paleogene volcanic rocks from the north-central Lut block, eastern Iran

The Lut block in eastern Iran is a micro-continental block within the convergent orogen between the Arabian, Eurasian and Indian plates. Large areas of the north-central, eastern, and western Lut block are covered by volcanic rocks of Paleogene, Neogene and Quaternary age.  Peak volcanic activity took place in the north-central part of the Lut block during the Eocene, and then dramatically decr...

Nature and evolution of the lithospheric mantle beneath the passive margin of East Oman: evidence from mantle xenoliths sampled by Cenozoic alkaline lavas

24 25 Cenozoic alkaline lavas from the Al Ashkharah area, facing the Indian ocean along 26 the North-East Oman coastline, contain numerous small (‹ 2cm) mantle xenoliths. 27 They provide a unique opportunity to investigate the nature and evolution of the 28 upper mantle beneath the Oman passive margin, bordering the Owen Basin. All 29 studied xenoliths are porphyroclastic to equigranular spinel...