| 词条 | Hypogene |
| 释义 |
In ore deposit geology, hypogene processes occur deep below the earth's surface, and tend to form deposits of primary minerals, as opposed to supergene processes that occur at or near the surface, and tend to form secondary minerals.[1] At great depth the pressure is high, and water can remain liquid at temperatures well above 100 °C. Hot aqueous solutions originating in the magma contain metal and other ions derived from the magma itself, and also from leaching of surrounding rocks. Hypogene deposition processes include crystallization from the hot aqueous solutions rising through the earth's crust, driven by heat provided by the magma.[2] Major dissolved components are chlorine, sodium, calcium, magnesium and potassium, and other important components include iron, manganese, copper, zinc, lead, sulfur (as SO42− or S2− or both) carbon (as HCO3− and CO2) and nitrogen (as NH4). Most ore fluids contain chloride as the dominant anion.[3] As the solutions rise the temperature and pressure fall. Eventually a point is reached where the minerals start to crystallise out.[2] Minerals formed in this way are called primary, or hypogene, minerals. Sulfur is a common component of the fluids, and most of the common ore metals, lead, zinc, copper, silver, molybdenum and mercury, occur chiefly as sulfide and sulfosalt minerals.[3] Examples of primary minerals formed in this way include the sulfide minerals pyrite (FeS2), galena (PbS), sphalerite (ZnS), and chalcopyrite (CuFeS2). EtymologyThe word hypogene is derived from the Greek hypo- meaning "under" and -gene meaning "born" or "produced". The terms "hypogene" and "supergene" refer to the depth at which they occur. See also
References1. ^{{Cite journal |last=Rakovan |first=John |title=A Word to the Wise: Hypogene & Supergene |journal=Rocks & Minerals |volume=78 |issue=6 |pages=419 |date=November–December 2003 |publisher=Taylor & Francis |url=http://www.cas.muohio.edu/~rakovajf/WTTW%20Hypogene%20Supergene.pdf |doi=10.1080/00357529.2003.9926759 |accessdate=August 18, 2012}} {{geology-stub}}2. ^1 The Encyclopedia of Gemstones and Minerals (1991). Martin Holden. Publisher: Facts on File 3. ^1 Understanding Mineral Deposits (2000). Kula C Misra. Kluwer Academic Publishers 1 : Economic geology |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。