2013 Fiscal Year Final Research Report
Early evolution of ecosystem and biotic diversity revealed from Archean large microfossils
| Project/Area Number |
22340149
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Geology
|
|---|
| Research Institution | Nagoya University |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
MIMURA Koichi 名古屋大学, 大学院・環境学研究科, 准教授 (80262848)
YAMAMOTO Koshi 名古屋大学, 大学院・環境学研究科, 教授 (70183689)
|
|---|
| Project Period (FY) |
2010-04-01 – 2014-03-31
|
| Keywords | 西オーストラリア / 太古代 / 有機質微化石 |
|---|
| Research Abstract |
We performed detailed studies on Archean microfossils collected from 4 localities in the 3.4 Ga Strelley Pool Formation (SPF) and multiple localities in the 3.0 Ga Farrel Quartzite (FQ) in the Pilbara Craton, Western Australia. Morphological assemblages of SPF microfossils are not identical between localities. Furthermore, habit of colony of SPF lenticular microfossils is distinct form that of FQ lenses. The former is comprised only of lenses, whereas the latter is in most cases associated with small spheroids. HF-HCl extraction of the lenticular microfossils was successful and revealed the occasional presence of small vacuoles, fibrillar structures, and/or reticulation in their flanges. These results indicate the presence of surprisingly diverse and complex microorganisms in the Early and Mesoarchean shallow water ecosystem.
|
