Webpoikilitic texture, and equigranular versus porphyritic textures in terms of material properties and physical conditions through the number density of crystals. In Appendices A-C, the detailed derivations of the equa- tions for moments of crystal size distribution function and of scaling relation for number density are presented. WebNorthwest Africa (NWA) 6342 is an intermediate, poikilitic shergottite, found in Algeria in 2010. It is comprised of two distinct petrographic areas; poikilitic domains with rounded Mg-rich olivine chadacrysts enclosed by large low-Ca pyroxene oikocrysts, and a nonpoikilitic domain mainly comprised of subhedral olivine and vesicular recrystallized plagioclase.

ALEX STREKEISEN-Ophitic-

WebJun 6, 2024 · poikilitic. poikilitic ( comparative more poikilitic, superlative most poikilitic ) ( geology) Describing the texture of an igneous rock that has small crystals of one … エコカラット サンプル請求 個人

Poikilitic texture geology Britannica

WebOphitic texture, a variant the poikilitic texture, is one where random plagioclase laths are enclosed by pyroxene or olivine. If plagioclase is larger and encloses the ferromagnesian minerals, then the texture is subophitic and the laths typically impinge on one another to form sharp angles. Note that the change from intergranular through ... WebAug 23, 2014 · The most likely site where such reactions can take place is the asthenosphere–lithosphere boundary. In this context, poikilitic xenoliths may provide … WebSupercooling of repeated influxes of high-MgO (∼ 13.5 wt% MgO) tholeiitic magma emplaced along the floor of the Kap Edvard Holm magma chamber led to the formation of fine grained, intraplutonic quench zones that define the bases of 12 macrorhythmic units. The quench zones grade upwards into poikilitic cumulates containing olivine dendrites, … panasonic micro hi fi