Chronological Studies of Lunar Mare Basalts 〜In-situ U-Pb dating of lunar breccias using SIMS〜
| Project/Area Number |
17540462
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Geochemistry/Astrochemistry
|
|---|
| Research Institution | Hiroshima University |
|---|
Principal Investigator |
TERADA Kentaro Hiroshima University, Graduate School of Science, Associate Professor (20263668)
|
|---|
| Project Period (FY) |
2005 – 2007
|
| Project Status |
Completed (Fiscal Year 2007)
|
| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥270,000)
Fiscal Year 2007: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2006: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2005: ¥1,700,000 (Direct Cost: ¥1,700,000)
|
|---|
| Keywords | in-situ analysis / lunar mare basalt / lunar meteorites / U-Pb dating / Evolution of the Moon / Chronology / 年代分析 / 隕石 / イオンマイクロプローブ / SIMS / 惑星科学 / 地球化学 |
|---|
| Research Abstract |
Most studies of lunar rocks and soils have been conducted on samples collected by the Apollo and Luna missions, but these represent samples from near-equatorial regions of the near side of the Moon. However, recent discoveries of lunar meteorites, which have been blasted off the Moon only to land in the hot desserts and Antarctic ice fields of Earth, have provided great impetus to lunar science. These meteorites provide potentially new insights into the petrologic history of unexplored regions of the Moon, including some as distant as the far-side. In spite of their scientific value, chronological studies of lunar meteorites have been difficult, since most of them are complex breccias, and in some cases, their radiometric "clocks" typically have been disturbed by subsequent impact events.
In order to better understand the petrogenetic history of lunar meteorites, we have developed in-situ U-Pb age dating of phosphates grains using Sensitive High-Resolution Ion MicroProbe (SHRIMP) instal
… More
led at Hiroshima University. Our in-situ U-Pb dating method has been successfully applied to the lunar basaltic meteorites and has enabled us to unravel the thermal evolution of unexplored regions of the Moon, which spanned for more than a billion years, from 3.9 Ga to 2.9 Ga. The majority of known mare-basaltic meteorite have crystallization ages younger than ca. 3.9 Ga are consistent with those of Apollo and Luna collections and activity of mare basalt magmatism in the unexplored areas of the Moon inferred from the relative chronology based on recent remote-sensing studies, still matching to the hypothesis that mare volcanism occurred mainly after the late heavy bombardment that ended at 3.9 Ga.
One exception, Kalahari 009, which is classified into VLT basalt shows the oldest age of 4.35 Ga and the shortest exposure age of 220 yr, concluding that the Kalahari 009 represents our first sample from VLT-type cryptomaria on the Moon prior to the late heavy bombardment The ancient age of Kalahari 009 and its geochemical features appear compatible with the "active" mechanism model, and maybe a manifestation of a pre-Imbrium basin-forming event on the Moon. Less
|
Report
(4 results)
Research Products
(37 results)
-
-
[Journal Article] Uranium-lead systematics of low-Ti basaltic meteorite Dhofar 287A : Affinity to Apollo 15 green glasses2008
Author(s)
Terada, K., Sasaki, Y., Anand, M., Sano, Y., Taylor, L.A., Horie, K
-
Journal Title
Earth and Planetary Science Letter 270
Pages: 119-124
Description
「研究成果報告書概要(欧文)」より
Related Report
-
-
-
-
[Journal Article] Uranium-lead systematics of phosphates in lunar basaltic regolith breccia, Meteorite Hills 012102007
Author(s)
Terada, K., Sasaki, Y., Anand, M., Joy, K., H., Sano, Y
-
Journal Title
Earth and Planetary Science Letter 259
Pages: 77-84
Description
「研究成果報告書概要(欧文)」より
Related Report
-
-
-
-
-
[Journal Article] Petrology and Geochemistry of LaPaz Icefield 02205 : A New Unique Low-Ti Mare-Basalt Meteorite2006
Author(s)
Anand, M., Taylor, L.A., Floss, C., Neal, C.R., Terada, K., Tanikawa, S
-
Journal Title
Geochimica et Cosmochimica Acta 70
Pages: 246-264
Description
「研究成果報告書概要(欧文)」より
Related Report
-
-
-
-
-
[Journal Article] Ion microprobe U-Pb dating of phosphates in lunar basaltic breccia Elephant Moraine 87521, Geophys. Res. Lett. 32, L20202,doi : 10.1029/2005GL0239092005
Author(s)
Terada, K., Saiki, T., Oka, Y., Hayasaka, Y., Sano, Y
-
Journal Title
Description
「研究成果報告書概要(欧文)」より
Related Report
-
-
-
-
-
-
-
-
[Presentation] U-Pb systematics of phosphates in lunar basaltic regolith breccia, MET 012102007
Author(s)
Terada, K., Sasaki, Y., Anand, M., Joy, K.H., Sano, Y
Organizer
The 31th Symposium on Antarctic Meteorites
Place of Presentation
Tokyo, Japan
Description
「研究成果報告書概要(欧文)」より
Related Report
-
-
-
-
-
-
-
-
-
-
-
-
-
