美国研究人员发现太阳系最古老矿物“盘古石”

yangqiji

核心提示：美国研究人员近日在1969年坠落的陨石中发现了一种科学界前所未见的古老矿物，并以中国古代神话中开天辟地的盘古将其命名为“盘古石”。它被认为是太阳系最古老的矿物之一，将帮助人类了解太阳系的起源和演变过程。

科技日报报道 美国研究人员近日在1969年坠落的陨石中发现了一种科学界前所未见的古老矿物，并以中国古代神话中开天辟地的盘古将其命名为“盘古石”。它被认为是太阳系最古老的矿物之一，将帮助人类了解太阳系的起源和演变过程。
相关论文将刊登在7月出版的新一期《美国矿物学家》杂志上。论文主要作者、加州理工学院科学家马驰26日在接受新华社记者采访时说，“盘古石”是一种新的钛氧化物，最初是在“阿连德”陨石内的一个超耐火杂质中通过扫描式电子显微镜发现的。
耐火杂质是太阳系中最早形成的固体物质，它们的形成时间早于地球和其他行星。所谓“耐火”是指这些包含矿物的杂质可以在高温和极端环境中稳定存在。
马驰介绍说，“盘古石”不仅是一种新的矿物质，也是一种科学界前所未知的材料。它和近期发现的其他耐火材料将帮助人类进一步了解它们形成和演变的条件，并有助于了解太阳系的起源和演化。
1969年，一颗被命名为“阿连德”的陨石坠落在墨西哥境内。它是迄今最大的碳质球粒陨石，在坠落地球后的40多年里，一直是科学界研究太阳系早期状况的“宝藏”。（来源：科技日报）

housex

这也能发现呀，看看

wendiangang

什么都能写啊

三石园

ALLENDE
Stone (CV3.2)
Chihuahua, Mexico
Fell Feb.8,1969
Approx. recovered weight 2 tons
-----------------------------------
igh-temperature minerals called CAIs (calcium-aluminium inclusions) and are composed of silicates and oxides of calcium, aluminium, and titanium.
These large CAIs, characteristic of CV chondrites, have been intensely studied in the famous meteorite of Allende. Allende fell in Mexico in 1969, shortly before Neil Armstrong took his first step on the Moon. The CAIs of Allende contain fine-grained, microscopic diamonds - and those diamonds exhibit strange isotopic signatures that point to an origin outside of our solar system. They are interstellar grains that have proven to be older than the earth and the sun, and probably they are the product of a nearby supernova, of a dying star that made his last breath when our own system formed. Traces of this supernova have been trapped within the CAIs and preserved in the CV group and other carbonaceous chondrites to this day.

三石园

CV GroupThe chondrites of this group are named for their type specimen, the meteorite of Vigarano, which fell in Italy in 1910. The CV group has about 50 members, but the number of actual CV falls has to be estimated to be somewhat lower since many of them are paired finds from the hot deserts of Africa and the blue-ice fields of Antarctica.
Most CV chondrites belong to petrologic type 3, and only one has been found to belong to type 2 as well as one other that has been classified as type 4. The structure and composition of these carbonaceous chondrites is more close to that of ordinary chondrites. In a dark-grey matrix of mainly iron-rich olivine, the meteorites of the CV group exhibit large, well-defined chondrules that are made of magnesium-rich olivine, often surrounded by iron sulfide. The meteorites of this group also contain white, irregular inclusions of different size that often make up more than 5% of the meteorite. These inclusions are high-temperature minerals called CAIs (calcium-aluminium inclusions) and are composed of silicates and oxides of calcium, aluminium, and titanium.
These large CAIs, characteristic of CV chondrites, have been intensely studied in the famous meteorite of Allende. Allende fell in Mexico in 1969, shortly before Neil Armstrong took his first step on the Moon. The CAIs of Allende contain fine-grained, microscopic diamonds - and those diamonds exhibit strange isotopic signatures that point to an origin outside of our solar system. They are interstellar grains that have proven to be older than the earth and the sun, and probably they are the product of a nearby supernova, of a dying star that made his last breath when our own system formed. Traces of this supernova have been trapped within the CAIs and preserved in the CV group and other carbonaceous chondrites to this day.
The chondrites of the CV group are further divided into three subgroups. The type specimen Vigarano and some other meteorites belong to the reduced subgroup designated as CV3R. These CVs show a higher chondrule abundance as well as more reduced metal and less magnetite than the other two oxidized subgroups. One of these oxidized subgroups is named for the fall of Allende and has been designated as CV3OxA. The meteorites of this subgroup contain minerals like andradite, grossular, kirschsteinite, nepheline and others that aren't found in any other CV subgroup. The other oxidized subgroup is named for the fall of Bali and is designated as CV3OxB. The members of this subgroup represent the most oxidized CVs and show traces of aqueous alteration as well as phyllosilicates that aren't found in the other two subgroups.

三石园

三石园 发表于 2012-9-30 12:55
ALLENDE
Stone (CV3.2)
Chihuahua, Mexico

CV GroupThe chondrites of this group are named for their type specimen, the meteorite of Vigarano, which fell in Italy in 1910. The CV group has about 50 members, but the number of actual CV falls has to be estimated to be somewhat lower since many of them are paired finds from the hot deserts of Africa and the blue-ice fields of Antarctica.
Most CV chondrites belong to petrologic type 3, and only one has been found to belong to type 2 as well as one other that has been classified as type 4. The structure and composition of these carbonaceous chondrites is more close to that of ordinary chondrites. In a dark-grey matrix of mainly iron-rich olivine, the meteorites of the CV group exhibit large, well-defined chondrules that are made of magnesium-rich olivine, often surrounded by iron sulfide. The meteorites of this group also contain white, irregular inclusions of different size that often make up more than 5% of the meteorite. These inclusions are high-temperature minerals called CAIs (calcium-aluminium inclusions) and are composed of silicates and oxides of calcium, aluminium, and titanium.
These large CAIs, characteristic of CV chondrites, have been intensely studied in the famous meteorite of Allende. Allende fell in Mexico in 1969, shortly before Neil Armstrong took his first step on the Moon. The CAIs of Allende contain fine-grained, microscopic diamonds - and those diamonds exhibit strange isotopic signatures that point to an origin outside of our solar system. They are interstellar grains that have proven to be older than the earth and the sun, and probably they are the product of a nearby supernova, of a dying star that made his last breath when our own system formed. Traces of this supernova have been trapped within the CAIs and preserved in the CV group and other carbonaceous chondrites to this day.
The chondrites of the CV group are further divided into three subgroups. The type specimen Vigarano and some other meteorites belong to the reduced subgroup designated as CV3R. These CVs show a higher chondrule abundance as well as more reduced metal and less magnetite than the other two oxidized subgroups. One of these oxidized subgroups is named for the fall of Allende and has been designated as CV3OxA. The meteorites of this subgroup contain minerals like andradite, grossular, kirschsteinite, nepheline and others that aren't found in any other CV subgroup. The other oxidized subgroup is named for the fall of Bali and is designated as CV3OxB. The members of this subgroup represent the most oxidized CVs and show traces of aqueous alteration as well as phyllosilicates that aren't found in the other two subgroups.

三石园

These inclusions are high-temperature minerals called CAIs (calcium-aluminium inclusions) and are composed of silicates and oxides of calcium, aluminium, and titanium.
_{These large CAIs, characteristic of CV chondrites, have been intensely studied in the famous meteorite of Allende. Allende fell in Mexico in 1969, shortly before Neil Armstrong took his first step on the Moon}. The CAIs of Allende contain fine-grained, microscopic diamonds - and those diamonds exhibit strange isotopic signatures that point to an origin outside of our solar system. They are interstellar grains that have proven to be older than the earth and the sun, and probably they are the product of a nearby supernova, of a dying star that made his last breath when our own system formed. Traces of this supernova have been trapped within the CAIs and preserved in the CV group and other carbonaceous chondrites to this day.