gabbro

([degrees]) ([degrees]) /location Alutaguse domain 1 1.0 326 30 Reject Gabbro 2 2.4 326 30 Reject Marble 3 6.3 326 30 Reject Gneiss 4 22.0 Pyroxene-bearing calc-silicate 5 13.9 Quartzite Estonian post-orogenic plutons 6 0.91 352 17 Accept Taadikvere quartz monzonite 7 3.6 Virtsu quartz monzonite Estonian anorogenic plutons 8 0.46 352 17 Accept Abja quartz monzodiorite 9 0.91 326 30 Accept Sigula gabbro-diabase 10 1.04 352 17 Reject Riga plagioclase porphyry 11 0.12 Marjamaa rapakivi granite I phase Status indicates a successful (Accept) or unsuccessful (Reject) model after the gravity (Status 1) and magnetic (Status 2) analyses; [rho] = density; [z.sub.T] = depth to the top of the model; h = vertical extent of the model (Fig.

Figure 6b shows conventional spider diagrams for seven major and 28 trace elements in the Titanic (THH), Hanson (HQB), HDG, and ABG gabbros to provide a general visual assessment of similarities and differences between the four sample means.

These gabbros exhibit high incompatible trace element concentrations (LILE, LREE, Pb), in conjunction with negative Nb-Ta-Ti anomalies, and a heterogeneous Sr-Nd isotopic composition (e.g.

Plagiogranite unit of study area is located in northwest of the city Noorabad that is a small white mass having boundary fault with layered gabbros. The minerals in these rocks consist of plagioclase, amphibole and quartz that have granular textures and their plagioclase altered to sericite and epidotite (Fig 4C).

The two-month expedition, aboard the drilling vessel JOIDES Resolution, confirmed for the first time the widespread existence of layered gabbros in the lower crust.

Keywords: Muslim Bagh Ophiolite; Gabbros; Petrology; Geochemistry; Petrogenesis; Tectonic setting

Thus, periodic pressure changes result in the light-and-dark banding observed in ophiolite gabbros.

A regional survey carried out by Presur found a geochemical nickel anomaly in an area characterised by the development of a gossan out cropping on altered gabbros. Short (approximately 5 m) vertical percussion drilling and deeper (up to 550 m) diamond coring dipping at 450 were carried out by Atlantic Copper to trace the downward extension of the observed oxidation cap and to identify the extension of the sulphide mineralisation.

When the ODP scientists drilled into a level spot on the wall of the fracture zone valley, they found coarsely crystalline rocks called gabbros, which are known to make up the lower segment of the crust.

This group includes a wide variety of rocks ranging from gabbros and basalts to granites and rhyolites.

Isotropic gabbros existing in this Ophiolitic melange are seen in northeastern part of the region and Plagioclase and Pyroxene crystals can be spotted in their mineralogy composition; these rocks also have tolerated weak degrees of metamorphism.