Discovery of especially large bubble-like miarolitic granites in Laoshan and its geological and geomorphic significance
Recently, some especially large bubble-like miarolitic caves in A-type granites in Laoshan have been discovered with the largest diameter of up to 3.1 m, far exceeding the granitic miarolitic caves previously reported, thus adding new knowledge to geology. This helps to study the primary environment for granites formed in Laoshan and also reveal genesis of “natural-mortar” micro-landform for granites in Laoshan. The existence of a new genesis type—“bubble-like miarolitic caves” of speleology is also confirmed by this discovery. Especially large bubble-like miarolitic caves are rare geological relics with high ornamental, science and tourism value.
Caverna del Valle de Los Lisos: una hipótesis sobre su origen en el contexto geomorfológico de las Sierras de Córdoba, Argentina
The cavern of El Valle de Los Lisos is the closure of a watershed of approximately 133 hectares, located in Los Gigantes massif of the Achala batholith, Córdoba province, Argentina. This cavern is formed by a set of intricated passages developed in a granitic rock. The passages have 20 meters of horizontal advance in North-South direction, and 25 meters of total descent. The stream that drains the basin flows through its lower level. According to the observations, a genetic-evolutionary model of the cavern is proposed, which is consistent with the Sierras de Córdoba regional geomorphological evolution. The model consists of three stages after the emplacement of intrusive body: 1) A deep weathering profile development that conditions the formation of a paleo-relief with a predominance of a rounded morphology; 2) Hydrographic basin generation from an erosive and structural escarpment, which feeds the channel that circulates through the cave; 3) Main galleries formation in successive erosion phases.
Household economy and gendered labor in the 17th centurya.d. on Guam
Abstract The gendered division of labor in household economies is well known in documentary accounts of many societies, although archaeological evidence for it is often elusive. Our study compares ethnohistorical accounts of household organization with archaeological patterns at a 17th-century village on the island of Guam in the Marianas archipelago to determine if these different sources of evidence provide similar insights. We investigated archaeological assemblages from two latte (megalithic) buildings to document their economic activities. Unexpected differences in their assemblages revealed that economic activities varied between the two latte buildings. They were domiciles of a single economically integrated household, but their disparate functions likely signaled a gendered division of labor. This study reveals aspects of gendered labor that documentary accounts do not fully describe. Our findings suggest that the assumption that domestic buildings were functionally redundant in traditional societies must be tested on a case-by-case basis.