Chondritic ingredients: I. Usual suspects and some oddballs in the Leoville CV3 meteorite

Chondritic ingredients: I. Usual suspects and some oddballs in the Leoville CV3 meteorite
复制标题

球粒陨石成分:我通常怀疑 Leoville CV3 陨石中的一些奇怪成分

DOI:
10.1111/j.1945-5100.2011.01318.x
复制
发表时间:
2012
影响因子:
2.2
通讯作者:
A. Pack
A. Pack
中科院分区:
地球科学3区
文献类型:
--
作者:
A. Patzer;D. C. Hezel;V. Bendel;A. Pack

文献摘要

参考文献

被引文献

相似文献

还原的CV3球粒陨石是相对原始的岩石,是探索行星形成之前的过程的主要研究对象。我们仔细研究了增生角砾岩Leoville中不同CV3组分的岩相学特征和微量元素组成。文中给出了岩石学结果。我们的样品(2.2cm2 )没有角砾岩。主要成分--约65 面积%--是细粒到粗粒的I型铁镁球粒。次要成分(按二维丰度顺序)包括耐火包裹体、富铝球粒和中等挥发成分的非常细的结晶碎屑。II型球粒陨石和金属块零星出现。球粒陨石与基质的比例约为3:1。中、粗粒球粒陨石呈斑状结构,可能是不完全熔融造成的,并有频繁的、部分或连续的重结晶尘埃边缘。细粒度的种群很可能代表了随机分割的尘埃边缘。边缘物质和一些中等颗粒的物体相对富含硫铁矿。铁镍金属是稀有的。此外,几乎所有的成分都显示出令人震惊的参差不齐或错综复杂的轮廓。只有少数几个没有轮缘的部件呈现出平滑的轮廓。碳质球粒陨石不完全熔融和形成重结晶或火成岩边缘的证据确凿,表明这两个过程都是广泛发生的事件。《利奥维尔》中观察到的特征支持这一结论。此外,我们的发现表明,在充满尘埃的湍流区域,表面磨损可能是在尘埃边缘固结之后发生的。或者,至少有边框球粒的不规则、曲折的性质可能是尘埃吸积事件所固有的,并没有被随后的加热抹去。
Reduced CV3 chondrites are relatively pristine rocks and prime candidates for studies exploring processes that predated planet formation. We closely examined the petrographic features and trace elemental composition of different CV3 constituents in the accretionary breccia Leoville. The petrographic results are presented here. Our sample (2.2 cm2) is not brecciated. The main ingredient—about 65 area%—is fine‐ to coarse‐grained ferromagnesian type I chondrules. Minor constituents (in order of 2‐D abundance) include refractory inclusions, Al‐rich chondrules, and very fine‐crystalline clasts of moderately volatile composition. Type II chondrules and metal nuggets occur sporadically. The chondrule–matrix ratio is approximately 3:1. Medium‐ and coarse‐grained chondrules exhibit porphyritic textures, probably caused by incomplete melting, and frequent, partial or continuous, recrystallized dust rims. The fine‐grained population most likely represents randomly sectioned dust rims. The rim material and some of the medium‐grained objects are relatively troilite‐rich. Iron‐nickel metal is rare. In addition, almost all constituents show strikingly ragged or convoluted outlines. Only a few, rim‐less components exhibit smooth contours. Evidence for incomplete melting and the formation of recrystallized or igneous rims in carbonaceous chondrites is well established, suggesting that both processes were widespread events. The observed features in Leoville support this conclusion. In addition, our findings indicate that surface abrasion in a turbulent dust‐filled regime may have taken place after the consolidation of dust rims. Alternatively, the irregular, convoluted nature of at least the rimmed chondrules may have been inherent to the dust accretion event and was not erased by subsequent heating.
DOI: 10.1016/s0016-7037(03)00486-1
发表时间: 2004-02-01
影响因子: 5
作者:
Lee, MR;Bland, PA
通讯作者: Bland, PA
C3球粒陨石中难熔包裹体的主量元素化学和同位素组成:凝结和蒸发的单独作用☆
DOI: 10.1016/s0016-7037(00)00396-3
发表时间: 2000
影响因子: 5
作者:
L. Grossman;D. Ebel;S. Simon;A. Davis;F. Richter;N. Parsad
通讯作者: N. Parsad
RENAZZO 中的吸积纹理、铁蒸发和再凝结
DOI: --
发表时间: 2001
期刊:
影响因子: --
作者:
Chondrules B. Zanda;M. Bourot;R. Hewins;B. A. Cohen;J. S. Delaney;M. Humayun;A. J. Campbell
通讯作者: A. J. Campbell
Leoville CV3 球粒陨石金属中的包裹体
DOI: --
发表时间: 1990
期刊:
影响因子: --
作者:
B. Zanda;M. Denise;C. Perron
通讯作者: C. Perron
Leoville CV 碳质球粒陨石的冲击效应:透射电子显微镜研究
DOI: --
发表时间: 1992
期刊:
影响因子: --
作者:
Tomoki Nakamura;K. Tomeoka;H. Takeda
通讯作者: H. Takeda