关键词: 蛇绿混杂岩, 铬铁矿, 重砂异常, 西藏

Abstract:

Heavy minerals prospecting is low cost but workable. Lots of clues and deposits (occurrences) were found through Tibet’s 1：200k heavy minerals survey, such as chromium, tungsten, tin, lead, zinc and molybdenum. Tibet’s chromites are chiefly hosted in the ultrabasic units of two ophiolite melange zones, one in south and one in north, in which heavy minerals anomalies are zoning, highly consistent with ultrabasic rocks and chromite deposits. The ultrabasic rocks contain large quantity of black chrome spinel, resistant to weathering, heavy, and stable, which is zoning as an outstanding prospecting. This paper discusses the prospecting direction in the two zones attempting to find new ultrabasic units or chromite resources.

Key words: ophiolite mélange, chromite, heavy minerals anomaly, Tibet