The early stage of the crustal foumation in the solar system

太阳系地壳爆发的早期阶段

• 批准号: 05453005
• 负责人: TAGAI Tokuhei
• 金额: $ 3.84万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05453005/
• 关键词: material evolution; eucrite; Lunar highland anorthosite; archean anorthosite; plagioclase; microtexture; weathering; 地殻進化; 古環境; 変質作用; 斜長岩

The evolution of crust in the solar system was investigated. The most primitive crust can be represented by eucrites, the intermediately progressed crust by lunar highland anorthosite and the most progressed one by the earth. However, the early earth's crust was almost lost because of extensive colcanic and tectonic activities of the earth.We selected ;as eucrites : ALH85001, Moore County, Serra de Mage, Moamaas Lunar highland anorthosite ; Lunar 76335as an archean anorthosite : BVL19b from Canadian shield and Ylamaa.The diffuse scattereing of c-reflections of plagioclase is sensitive to the cooling rate in the temperature range of 800-200ﾟC.We measured the profiles of c-reflections using X-ray diffraction with lmaging Plate and from the half-hight-width of the profile, the size of c-domain was calculated.The most important result was that Lunar 76335 showed the largest domain size. In the archean anorthosite (BVL19B), the trace of alteration of Precambrian age was found. the alteration products were chlorite and zoisite. They grew along the cleavage plane of host plagioclase and retained the crystallographic orientation, which could be interpreted as the result of graphoepitaxy.

研究了太阳系地壳的演化。最原始的地壳以真橄榄岩为代表，中等演化的地壳以月高地斜长岩为代表，最演化的地壳以地球为代表。然而，由于地球广泛的火山活动和构造活动，早期地壳几乎消失了，我们选择：ALH 85001，摩尔县，Serra de法师，Moamaas月球高地斜长岩; Lunar 76335作为太古代斜长岩：BVL 19 b的散射特征。在800-200 ℃的温度范围内，斜长石的c反射对冷却速率很敏感。我们用X射线衍射成像板测量了c反射的轮廓，从轮廓的半高宽，计算了C畴的尺寸，最重要的结果是Lunar 76335的C畴尺寸最大。在太古代斜长岩（BVL 19 B）中，发现了前寒武纪蚀变的痕迹，蚀变产物为石英和石英。它们沿着寄主斜长石的解理面生长，并保持晶体学取向，这可能是图形外延的结果。

项目成果

M.Suzuki, T.Tagai, T.Hoshi, H,Takeda: "Oriented growth of chlorite and zoisite as the alteration products in a plagioclase" Min.Jour. 17(in press). (1995)

M.Suzuki、T.Tagai、T.Hoshi、H、Takeda：“绿泥石和黝帘石作为斜长石中的蚀变产物的定向生长”Min.Jour。

T.Tagai: "A new phase of natural feldspar,An_xOr_<1-x'>x=0.5" Proc.Japan Acad.71B(in press). (1995)

T.Tagai：“天然长石的新相，An_xOr_<1-x>x=0.5”Proc.Japan Acad.71B（正在印刷中）。

T.Tagai: "A new modification of slawsonite,SrA1_2Si_2O_8,and its phase transition" Zeits.Krist.(submitted).

T.Tagai：“斜钠石的一种新变体，SrA1_2Si_2O_8 及其相变”Zeits.Krist.（已提交）。

T.Tagai, T.Hoshi, M.Suzuki, A,Kato, S.Matsubara: "A new modification of slawsonite, SrAl2Si2O8 and its phase transition." Zeit.Krist. (submitted). (1995)

T.Tagai、T.Hoshi、M.Suzuki、A、Kato、S.Matsubara：“斜锰矿的新变体、SrAl2Si2O8 及其相变。”

Yamagichi et al.: "Textural variations and impact history of the Millibillillie eucrite." Meteoritics. (in print). (1993)

Yamagichi 等人：“Millibillilie eucrite 的结构变化和影响历史。”