نتایج جستجو برای: mafic dykes

تعداد نتایج: 2656  

Journal: :Minerals 2022

We present in situ major element, trace and Sr–Nd isotope data of apatite from an alkaline–carbonatite intrusion the South Qinling Belt (SQB) to investigate their magma evolution mantle sources. The Shaxiongdong (SXD) complex consists predominantly early Paleozoic hornblendite, nepheline syenite, subordinate Triassic carbonatite. Apatites all lithologies are euhedral subhedral belong fluorapati...

2009
J. F. Mustard B. L. Ehlmann S. L. Murchie F. Poulet N. Mangold J. W. Head J.-P. Bibring L. H. Roach

[1] Definitive exposures of pristine, ancient crust on Mars are rare, and the finding that much of the ancient Noachian terrain on Mars exhibits evidence of phyllosilicate alteration adds further complexity. We have analyzed high-resolution data from the Mars Reconnaissance Orbiter in the well-exposed Noachian crust surrounding the Isidis basin.We focus on data from the Compact Reconnaissance I...

2012
J. R. Skok J. F. Mustard L. L. Tornabene C. Pan D. Rogers S. L. Murchie

[1] The earliest formed crust on a single plate planet such as Mars should be preserved, deeply buried under subsequent surface materials. Mars’ extensive cratering history would have fractured and disrupted the upper layers of this ancient crust. Large impacts occurring late in Martian geologic history would have excavated and exposed this deeply buried material. We report the compositional an...

ترابی, قدرت, خلیلی, محمود, سعیدی, معصومه, فلاحتی, سمیه, محوری, رضوان, نقره‌ئیان, موسی,

The protolith of rodingitic dykes of Naien area are pegmatoidic gabbros, microgabbros, dolerites and fewer amphibolites. Textural features and thickness are effective parameters for rodingitization of these dykes. Slight thickness of microgabbro and pegmatoidic dykes have more undergone rodingitization and have passed the primary to advanced stages of static rodingitization (due to the presence...

Journal: :Precambrian Research 2022

• 1.80–1.75 Ga TIB-1 granite emplacement during late-Svecofennian orogeny. Sills injected into TTG gneisses leaving mafic pendant layers between sills. Melt pathways along foliation, thrusts, fold axial surfaces, and strike-slip faults. Back-arc extension in advancing accretionary orogenic model. The Ersfjord Granite is part of a suite c.1.80–1.75 syeno-granites the West Troms Basement Complex,...

2008
ÖMER FARUK ÇELİK

The metamorphic sole rocks at the base of mantle peridotites from the Mersin ophiolite consist of amphibolites and metasedimentary lithologies. Mineral parageneses in the metamorphic sole rocks exhibit amphibolite and greenschist facies assemblages. Geothermobarometric studies based on mineral assemblages and chemical compositions of minerals indicate that average metamorphic temperature during...

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