PALEOZOIC LIMESTONE BRECCIAS FORMED BY QUENCHED MICRO-GRAINS OF JAPAN AND USA SAMPLES

On progressive system among air, liquid and solid states of Earth, carbonates are formed as typical materials with short-periods compared with long silicate-bearing rocks. However, we have still obtained irregularly older carbonate rocks on the surface against complete elimination on our Earth activity. The main purpose of the paper is to elucidate remnants of quenched micro-grains on the Paleozoic limestone breccias of the samples at Japan (Akiyoshi and Takamatsu), and USA ( Sierra Madera and Santa Fe).

The Paleozoic Akiyoshi samples (up to 250m in depth) drilled by the Akiyoshi Science Museum show significant changes of physical properties of powdered calcite minerals along the fossil reversal distributions [1-4] with anomalous abundances of siderophiles of bulk XRF data analysis at the bottom of 243m in depth[3]. The present in-situ data of FE-ASEM and micro-Raman data show that the deeper samples have re-crystallized calcite-halite and quenched veins with iron-carbon grains with shocked nano-carbon [2-4].

The Miocene Takamatsu buried-crater structure formed on the Rhyoke granite shows crater-related minerals and breccias rocks drilled to1500m in depth through crater bottom at 1,000m.

The present in-situ FE-ASEM and micro-Raman data show that the deep samples have re-crystallized calcite-halite and quenched veins with iron-carbon grains with shocked nano-carbon [2-4]. The present carbonates data show that the deep samples have re-crystallized and quenched carbon-bearing grains [2-4].

Four American Paleozoic limestone samples of the Carlsbad, Sierra Madera limestone, Alamo breccias and Santa-Fe breccias are investigated, where the in-situ data of the Santa Fe sample contain clearly shocked limestone with fluid-tube texture and separated nano-carbon grains [4].

Softer target rocks of carbon-bearing rocks and fluids are considered to be remained at harder silicate-rocks by rapid quenching shock-wave process at the surface. The present result can be confirmed at older limestone breccias of Japan (Akiyoshi and Takamatsu), and USA( Sierra Madera and Santa Fe) samples [4].

Reference: [1] Miura Y. (1986): Bull. Akiyoshi-Dai Museum of Natural History (Yamaguchi), 22, 1-22. [3] Miura Y. (1996): Shock-wave Handbook (SV-Tokyo), p.1073-1209. [4] Miura Y. (2015): Japan G U-2015 (English), pp.1.