A high correlation between agate crystallite size and age of host rock shows that the formation of wall-banded agates is penecontemporaneous with the formation of the host rock. The determination of crystallite size in wall-lining agate allows either an estimation of the approximate age of the ...
Boley Agate — Chert Breccia Clasts in the Vamoosa FormationNeil H. SunesonWilliam G. LyonDavid Goza
Extensive two-tier structure and breccia stockwork formation by hydrothermal processes in the first Parana lava flow covering the Botucatu paleoerg-turned-... chemical and mineralogical alteration in the previously oxidized flow, resulting in a gray to white color and the formation of amethyst and ...
Variations of cathodoluminescence and Raman data between single bands in agates suggest alternating formation of fine-grained, highly defective chalcedony intergrown with moganite, and coarse-grained low-defect quartz. Multiple zones indicate dynamic internal growth during a self-organizational crystallization...
ALLMON, Warren D
The method involves the formation above the substrate of regions of epitaxial type automatically aligned with the gate electrode and designed to form the source and drain regions of the transistor. These regions are doped by ion implantation using a comparatively low implantation energy such that the...
The method involves the formation above the substrate of regions of epitaxial type automatically aligned with the gate electrode and designed to form the source and drain regions of the transistor. These regions are doped by ion implantation using a comparatively low implantation energy such that the...
4.1.3. Formation of ASCS on Quaternary Sediments of Varying Thickness Currently, this hypothesis is the main working one. Figure 12 shows an outcrop where Permian sediments are overlain by a Quaternary cover of varying thickness. Figure 12. Permian sediments overlain by Quaternary sediments of va...
It is concluded that the oxidation of organic acids was involved in the formation of these patterns and that these rocks indicate oxidation鈥搑eduction reactions involving organic carbon, which itself may be abiotic or biological in origin. Hence, agate geodes and concretions represent the abiotic ...