雷州半岛滨海砂矿的分布富集规律

THE DISTRIBUTIVE AND ENRICHED LAW OF LITTORAL PLACERS IN LEIZHOU PENINSULA

根据对河流流向、波浪、潮流等水动力条件的分析,雷南东海岸最有利子砂的分布和富集,大中型矿床都蕴藏于此。成矿期主要为距今3.5万年高海平面以来的晚更新世时期,次要为距今600。年高海平面以来的中晚全新世时期。富矿的地貌标志为高程大于20m的高砂堤和20-1 Om高程的中砂堤。

Littoral placers in Leizhou Peninsula consist mainly of ilmenite,rutile and zircon. The Quaternary volcanic rocks are their mother rocks; but volcanic rocks of Shimaoling period (Q_1~2—Q_2~1) influence the concentration of the placers most greatly, and volcanic rocks of Huguangyan(Q_2~2)less greatly. According to analysis of the river direction, wave and tidal current, the deposit placers which were mainly formed since 35000 yr B.P. in the Late Pleistocene and secondly since 6000 yr B.P. in the Middle-Late Holocene are distributed in the eastern shore of South LeiZhou Peninsula. The geomorphological marks of rich placers are 10-20-meter middle sand barriers and over-20-meter high sand barriers.