Introduction: Because they are dominated by enstatite, a nearly FeO-free pyroxene, and Si-bearing FeNi metal, along with minor amounts of unusual monosulfides such as niningerite (MgS), oldhamite (CaS) and alabandite (MnS), the enstatite chondrites have long been thought to have formed under extremely reducing conditions [1,2]. Like the ordinary chondrites, enstatite chondrites exhibit a range ...

Introduction: Products of low-T aqueous alteration processes on Mars are relatively abundant in the nakhlites [1]. This includes mixtures of poorly crystalline clays and amorphous material, often dubbed iddingsite. They can be found in the mesostasis or forming veinlets in olivine [2] as well as being part of mineral assemblages, e.g. inside carbonate veinlets in Lafayette [3,4], in association...

Introduction: Remotely sensed geochemical data provide extremely valuable information concerning the global distribution of elements on a planetary surface, and are valuable in the identification of major crustal terranes. Planetary geochemical maps of Mars for several elements such as Th, K, and Fe have been or are currently being prepared and have yielded significant insights into large-scale...

The Open University's repository of research publications and other research outputs Combined chemical-oxygen isotope study of large igneous inclusions in ordinary chondrites Conference Item (2016). Combined chemical-oxygen isotope study of large igneous inclusions in ordinary chondrites. For guidance on citations see FAQs. c [not recorded] Version: Version of Record Copyright and Moral Rights ...

Barred olivine (BO) chondrules are some of the most striking objects in chondrites. Their ubiquitous presence and peculiar texture caught the attention of researchers and, as a consequence, considerable effort has been expensed on unraveling their origin(s). Here we report on a detailed study of two types of chondrules: the Classic and the Multiple-Plate Type of BO chondrules from the Essebi (C...

Flood basalt flows of the Columbia River Basalt Group commonly exhibit well-developed colonnade and entablature structures formed during cooling of individual flows. The colonnade refers to the well-defined columnar structure of many flows, which appears in the lowermost 10% to 30% and, in places, the uppermost 10% to 20%. Entablature refers to those parts of a flow that have smaller column dia...

COMPOSITIONS FROM WHICH APATITE CRYSTALLIZES. N. J. Potts 1,2* , R. Tartèse 1 , M. Anand 1,3 , I. A. Franchi 1 , W. van Westrenen 2 , J. J. Barnes 1,3 , A. A. Griffiths 1,4 1 Department of Physical Sciences, The Open University, Milton Keynes, UK, (*[email protected]) 2 Faculty of Earth and Life Sciences, VU University Amsterdam, NL 3 Department of Earth Sciences, The Natural History Muse...

Introduction: Knowledge of how crystals grow is of fundamental importance for interpreting textures observed in meteorites. However, data on crystal growth of rock-forming silicates for a very small degree of undercooling (< 1°C) are extremely rare. Recently [1], it was demonstrated that these very small degrees of undercooling could be experimentally approached by studying the kinetic of Oswal...

Research subject. Andesitic complexes of the Tondono caldera and Lokon-Empung volcano locate din northeastern part Sulawesi Island (Indonesia). Aim. To determine petrogenesis conditions andesites in northeast based on detailed studies volcanic rocks volcano. Materials methods. We studied rock samples collected by I.Yu. Safonova. andesites, conventional petrochemical, geochemical mineralogical m...