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  3. According to a recent theory, Archean-age gold-quartz vein systems were form

According to a recent theory, Archean-age gold-quartz vein systems were form

游客2024-01-13  74
问题     According to a recent theory, Archean-age gold-quartz vein systems were formed over two billion years ago from magmatic fluids that originated from molten granite-like bodies deep beneath the surface of the Earth. This theory is contrary to the widely held view that the systems were deposited from metamorphic fluids, that is, from fluids that formed during the dehydration of wet sedimentary rocks. The recently developed theory has considerable practical importance. Most of the gold deposits discovered during the original gold rushes were exposed at the Earth’s surface and were found because they had shed trails of alluvial gold that were easily traced by simple prospecting methods. Although these same methods still lead to an occasional discovery, most deposits not yet discovered have gone undetected because they are buried and have no surface expression.
    The challenge in exploration is therefore to unravel the subsurface geology of an area and pinpoint the position of buried minerals. Methods widely used today include analysis of aerial images that yield a broad geological overview; geophysical techniques that provide data on the magnetic, electrical , and mineralogical properties of the rocks being investigated; and sensitive chemical tests that are able to detect the subtle chemical halos that often envelop mineralization. However, none of these high-technology methods are of any value if the sites to which they are applied have never mineralized, and to maximize the chances of discovery the explorer must therefore pay particular attention to selecting the ground formations most likely to be mineralized. Such ground selection relies to varying degrees on conceptual models, which take into account theoretical studies of relevant factors.
    These, models are constructed primarily from empirical observations of known mineral deposits and from theories of ore-forming processes. The explorer uses the models to identify those geological features that are critical to the formation of the mineralization being modeled, and then tries to select areas for exploration that exhibit as many of the critical features as possible. [br] The theory mentioned in line 1 relates to the conceptual models discussed in the passage in which of the following ways?
选项 A、It may furnish a valid account of ore-forming processes, and, hence, can support conceptual models that have great practical significance.
B、It suggests that certain geological formations, long believed to be mineralized, are in fact mineralized, thus confirming current conceptual models.
C、It suggests that there may not be enough similarity across Archean-age gold-quartz vein systems to warrant the formulation of conceptual models.
D、It corrects existing theories about the chemical halos of gold deposits, and thus provides a basis for correcting current conceptual models.
E、It suggests that simple prospecting methods still have a higher success rate in the discovery of gold deposits than do more modern methods.
答案 A
解析 第1行所说理论，和文中所说模型有何关系?A．正确。会给矿石形成机制以有力解释，于是能支持这一有重大实际意义的模型。原文L44—47模型主要包括找矿经验和矿石形成理论。第1行的理论提供了后者，所以此说法成立。B．显示矿化问题。这和此理论无关。C．显示古代金矿系统无法相似到能保证建立模型。语气显非，作者对此理论是持赞成态度的。D．chemical halos of gold deposits和此理论无关。E．简单探测法和现代探测法相比有更高成功率。显然说反了。
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