A noritic clast from the Hedjaz chondritic breccia: implications for melting events in the early solar system.

Abstract

and Au were deter mined in a unique, noritic clast carrying a fractionated REE component from the Hedjaz (L) chondritic breccia by instrumental neutron activation analysis and isotope dilution mass spectrometry. The clast, previously described by Nakamura et al. (1990), consists of two lithologies, and is depleted in siderophile and moderately volatile lithophile elements when compared with its host meteorite. The REE abundance pattern of the clast is L-chondritic (1.4-1.6 x CI-chondrite) with a large (62%), positive Eu anomaly. Strontium is also enriched (3.2 x CI-chondrite) relative to trivalent REE.Chemical and petrologic data suggest that the elemental fractionations observed in the Hedjaz noritic clast could be accomplished in a single host-like parent body with several episodes of impact melting and heating. An impact melt enriched in feldspar components could have been generated in a neighboring region on a parent body, and then infiltrated into the precursor material of the clast. An enhancement of plagiophile elements would then be produced in the clast. Moderately volatile element and siderophile element fractionations could be related to gas /solid or gas /liquid processes and silicate/metal melt fractionations, respectively, which may have occurred during melting and formation of the clast.

Late accretion and lithification of chondritic parent bodies: Mg isotope studies on fragments from primitive chondrites and chondritic breccias

“…Bridges et al (1995b) described a feldspar-nepheline achondritic clast in Parnallee that has an O-isotopic composition indicating carbonaceous chondrite affinities. Several other large achondritic clasts include pyroxenitic or noritic fragments in Hedjaz (L3.7) (Nakamura et al 1990;Misawa et al 1992), troctolitic and/or dunitic and/or harzburgitic inclusions in Barwell (L6), Yamato (Y-) 75097 (L6), Y-794046 (H5), and Y-793241 (e.g., Prinz et al 1984;Hutchison et al 1988;Nagao 1994;Mittlefehldt et al 1995).…”

Accretionary mixing of a eucrite impactor and the regolith of the L chondrite parent body

“…) chondrite breccia contains a noritic clast which may have been produced from L precursor material that went through multiple heating/melting stages (Misawa et al. ).…”

“…A Crrich inclusion has been documented in the Los Martinez L6 chondrite breccia (Brearley et al 1991), which may be similar to the clast in Villalbeto de la Peña (Bischoff et al 2013). The Hedjaz L3.7-6 (Fredriksson et al 1986) chondrite breccia contains a noritic clast which may have been produced from L precursor material that went through multiple heating/melting stages (Misawa et al 1992).…”

Supermarkets and Household Food Acquisition Patterns in Vietnam in Relation to Population Demographics and Socioeconomic Strata: Insights From Public Data

“…The VHLSS belongs to the family of Household and Expenditure Surveys (HCES) which have been conducted regularly in several countries over several years (Kilic et al, 2017). HCES have also been used previously to study food consumption and nutrition at national levels, with the objective of supporting the Sustainable Development Goals (SDG) (Zezza et al, 2017).…”