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本文研究范围为17°—21°30′N,105°40′—110°E。根据沉积物中主要重矿物的种类与含量变化,把该区分成6个矿物区:(1)湾北部矿物区为电气石与红柱石等矿物区,是由湾北入海的河流输沙及沿岸冲刷物质共同提供的;(2)琼州海峡与雷州半岛西部沿岸矿物区以独居石、锆石和钛铁矿组合为特征,这里稳定重矿物高度富集,反映了该区沉积物经受了较强水动力作用;(3)湾西部矿物区为矽线石、绿帘石和角闪石区,该区是红河携带入海物质的主要沉积区;(4)湾中部矿物区,位于水深40—60米的粗粒级沉积物分布区,具有和湾西部矿物区十分相似的矿物组合,此为古红河三角洲的残留沉积区;(5)混合矿物区,由湾口自南向北介于其他矿物区之间的沉积带;(6)海南岛西南沿岸矿物区,根据其含不稳定矿物多,磨圆度差等特点,认为这里主要是由沿岸基岩的剥蚀物和水下出露基岩的冲刷物质就地沉积而成。
The research scope of this paper is 17 ° -21 ° 30’N and 105 ° 40’-110 ° E. According to the changes of the types and contents of the major heavy minerals in the sediments, the area is divided into six mineral zones: (1) The northern mineral zone of the Bay is a mineral zone such as tourmaline and andalusite, which is formed by river sediment transport and coastal Scouring material; (2) The mineral areas along the Qiongzhou Strait and the western Leizhou Peninsula are characterized by a combination of monazite, zircon and ilmenite, where the stability of heavy minerals is highly enriched, reflecting the fact that sediments in the area have been subjected to strong water (3) The Western Bay mineral area is sillimanite, epidote and amphibole, which is the main sediment area for the Honghe to carry into the sea. (4) The central Bay mineral area is located in the water depth of 40-60 meters The coarse-grained sediment distribution has a mineral assemblage that is very similar to that in the western part of the Bay. This is the remnant sedimentary area of the ancient Honghe delta. (5) The mixed mineral zone, which extends from south to north from the mouth of the bay to other mineral zones (6) According to the features of unstable minerals and poor roundness in Hainan Island, it is believed that there are mainly the erosion products of bedrock along the coast and the scouring material of underwater exposed bedrock In situ deposition.