scholarly journals Stratigraphy and eruption styles of Miocene volcanic rocks in the Ryozen district, NE Japan.

1996 ◽  
Vol 102 (8) ◽  
pp. 730-750 ◽  
Author(s):  
Takahiro Yamamoto
Keyword(s):  
Volcanic Rocks ◽  
Ne Japan

scholarly journals Thermoluminescence dating of Pleistocene volcanic rocks and pumice flow deposits in Onikobe-Naruko and adjacent areas, NE Japan

2006 ◽  
Vol 35 (2) ◽  
pp. 70-77 ◽  
Author(s):  
Isao TAKASHIMA ◽  
Hideki MURAKAMI ◽  
Duk-Geun HONG ◽  
I G.B. EDDY SUCIPTA ◽  
Youji MOURI ◽  
...  
Keyword(s):  
Volcanic Rocks ◽  
Thermoluminescence Dating ◽  
Pumice Flow ◽  
Ne Japan

TEM/AEM characterization of fine-grained clay minerals in very-low-grade rocks: Evaluation of contamination by empa involving celadonite family minerals

1996 ◽  
Vol 54 ◽  
pp. 694-695
Author(s):  
Gejing Li ◽  
D. R. Peacor ◽  
D. S. Coombs ◽  
Y. Kawachi
Keyword(s):  
Electron Microscopy ◽  
Volcanic Rocks ◽  
Analytical Electron Microscopy ◽  
Metamorphic Rocks ◽  
New Mineral ◽  
Chemical Compositions ◽  
Low Grade ◽  
Fine Grained ◽  
Depth Analysis ◽  
Mineral Aggregates

Recent advances in transmission electron microscopy (TEM) and analytical electron microscopy (AEM) have led to many new insights into the structural and chemical characteristics of very finegrained, optically homogeneous mineral aggregates in sedimentary and very low-grade metamorphic rocks. Chemical compositions obtained by electron microprobe analysis (EMPA) on such materials have been shown by TEM/AEM to result from beam overlap on contaminant phases on a scale below resolution of EMPA, which in turn can lead to errors in interpretation and determination of formation conditions. Here we present an in-depth analysis of the relation between AEM and EMPA data, which leads also to the definition of new mineral phases, and demonstrate the resolution power of AEM relative to EMPA in investigations of very fine-grained mineral aggregates in sedimentary and very low-grade metamorphic rocks.Celadonite, having end-member composition KMgFe3+Si4O10(OH)2, and with minor substitution of Fe2+ for Mg and Al for Fe3+ on octahedral sites, is a fine-grained mica widespread in volcanic rocks and volcaniclastic sediments which have undergone low-temperature alteration in the oceanic crust and in burial metamorphic sequences.

Sign in / Sign up

Export Citation Format

Share Document