ABSTRACT Carbonaceous chondrite meteorites are so far the only available samples representing carbon-rich asteroids and in order to allow future comparison with returned by missions such as Hayabusa 2 OSIRIS-Rex, it is important understand their physical properties. Future characterization of asteroid primitive classes, some them targeted sample-return missions, requires a better understanding ...

Robat-e Zengejeh rocks affected by a variety of events began from Precambrian. This research studied preserved effects of the events. Regional metamorphism is the oldest event in this rocks include schist, amphibolite and orthogneiss, that reached up to amphibolite facies. After this regional metamorphism, it seems that mesocratic (624±5Ma) and hololeucocratic granitoides intruded respectively....

In order to assess the presence or absence of fluids under peak metamorphic conditions within the inner aureole of the Etive igneous complex in west Scotland, eight suitable metabasic hornfels samples and one suitable pelitic hornfels were used to calculate water activities using a mineral equilibria. Calculated activities for water are lower than unity in the pelitic sample and extremely low i...

Introduction: CM carbonaceous chondrites have been constituent materials of hydrated planetesimals in the early solar system. They consist mainly of hydrous minerals as a result of extensive aqueous alteration. At a certain period after the aqueous alteration, many CM chondrites have been heated to higher temperature [e.g., 1], which caused evaporation loss of highly volatile elements [2] and d...

The existence of a core dynamo during the first billion years Earth history is closely related to thermal state Earth's interior and composition early atmosphere. scarcity well-preserved rock units older than 3.5 (Ga) has motivated paleomagnetic analysis detrital zircons. Studies zircons from Jack Hills, Australia, however, have found pervasive occurrence secondary ferromagnetic minerals, casti...