Petrography and geochemical outline studied carried out on Bérem dolerites have shown that they crosscut the local granitoıds of basement toward N100-120, EW N160E directions. Individual dyke may 5 m to 50 wide extend along strike 200 3 km. Microscopic observations distinguished lavas doleritic textures ophitic sub types. ICP-AES ICP-MS analyses representative samples basaltic trachyandesite ...

We have reappraised the age and composition of mid-Proterozoic Häme dyke swarm in southern Finland. The dominant trend dykes this is NW to WNW. Petrographic observations geochemical data indicate uniform, tholeiitic low- Mg parental magmas for all dykes. Nevertheless, variability incompatible trace element ratios, such as Zr/Y La/Nb, provides evidence changing mantle melting conditions variable...

Dolerites dykes of 4.5 to 25 m wide extend from 200m 1km, crosscut the Guébaké granitoids basement in northern Cameroon along EW N100E directions. Petrographic studies reveal microlitic porphyritic texture classical doleritic ophitic sub-ophitic types. dolerites are mainly composed various proportions skeletal plagioclase and feldspar, clinopyxene, amphibole oxides crystals. ICP-MS ICP-AES ge...

Post-mineralization activities may cause difficulties in the process of ore modeling in porphyry deposits. Sungun, NW Iran, is one of the porphyry copper deposits, in which dyke intrusions have made ore modeling more complicated than expected. Among different kinds of dykes, two types were chosen and the consequent geostatistical analyses were applied on. In this study, simple directional vario...

The study area is located in Ardabil province the northeast of Meshkinshahr city. More than 200 small and large Eocene-age dykes form outcrops this area. Laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) U–Pb zircon analyses yield a consistent age 44.3 ± 1.8 Ma for dyke swarms. These include tephritic, andesitic basaltic compositions, show enrichment LREEs (relative to HRE...

A flinty, spherulitic dyke of peralkaiine trachyte in a Precambrian dyke-swarm consists mainly of albite and aegirine. Within this, euhedral crystals of narsarsukite, NadTi,Fe)Si401o(F), occur as short prisms elongate parallel to c. This distinguishes them from all previously described narsarsukites, which have tabular habits. Minor phases present include micas, apatite, quartz, pectolite, nord...

A mafic dyke is a mass of rock generated in either sedimentary or igneous terrain and intrudes pre-existing cracks. It was common to see many enormous swarms the southern granulitic landscape made up archean rocks. Dykes tend be younger than surrounding body. Generally, dolerite has an ophitic texture medium fine grained. In study area country rocks petrographical microscope, XRD, FE-SEM techni...