海阳市招虎山一带崂山序列特征及成因类型分析
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摘要
海阳市招虎山主峰一带发育二长花岗岩和正长花岗岩,呈半环状分布于海阳断裂西侧。岩石谱系单位划分为5个单元,归属于崂山序列,其中二长花岗岩归属于浮山亚序列,正长花岗岩归属于石门山亚序列。空间上侵入体按侵入时间由早到晚呈由外向内的环状分布。由早到晚,各单元岩石的碱性程度呈渐趋加强,且各亚序列中由早到晚,岩石粒度由粗变细;由早到晚,微量元素Sr、Ba呈渐趋降低、Rb略有增高趋势;轻稀土、重稀土及稀土总量均呈渐趋降低,铕亏损加强。通过对各单元岩石学、地球化学等特征分析,认为该区的崂山序列成因类型为SI型,其岩浆来源于上地幔,在上侵过程中与地壳同熔、混染。该序列成岩温度为800～274.04℃;成岩压力为(4～0.7)×108 Pa。推断其初始结晶深度为13 km,定位深度为7～10 km,后期单元定位向上,趋于浅成岩。
Admellites and Syenogranite developed along the main peak of Zhaohu Mountain area of Haiyang City. They are distributed in a semi-circular shape on the west side of the Haiyang Fault. The rock pedigree unit is divided into 5 units, Attributable to Laoshan sequenece, The admellites belong to the Fushan subsequence, syenogranite belongs to Shimenshan subsequence, The space intrusion is distributed from the outside to the inside according to the intrusion time. From early to late, The alkalinity of each sequenece rock is gradually strengthened, And the grain size of each subsequence is coarse and fine, Trace elements Sr and Ba are gradually decreasing and Rb is slightly increasing, The total amount of light rare earth element, heavy rare earth element and rare earth is gradually decreasing, and the loss of Eu is strengthened. Analysis of the characteristics of petrology and geochemistry of each sequenece, it is considered that the genetic type of the Laoshan super unit in this area is SI. The magma is derived from the upper mantle and is melted and mixed with the earth's crust during the intrusion. The temperature of this sequenece diagenesis is 800～274.04℃;The diagenetic pressure is(4～0.7)×108 Pa. It is inferred that the initial crystal depth is 13 km and the depth of positioning is 7～10 km. Late unit positioning upwards, tending to shallow diagenesis.
Admellites and Syenogranite developed along the main peak of Zhaohu Mountain area of Haiyang City. They are distributed in a semi-circular shape on the west side of the Haiyang Fault. The rock pedigree unit is divided into 5 units, Attributable to Laoshan sequenece, The admellites belong to the Fushan subsequence, syenogranite belongs to Shimenshan subsequence, The space intrusion is distributed from the outside to the inside according to the intrusion time. From early to late, The alkalinity of each sequenece rock is gradually strengthened, And the grain size of each subsequence is coarse and fine, Trace elements Sr and Ba are gradually decreasing and Rb is slightly increasing, The total amount of light rare earth element, heavy rare earth element and rare earth is gradually decreasing, and the loss of Eu is strengthened. Analysis of the characteristics of petrology and geochemistry of each sequenece, it is considered that the genetic type of the Laoshan super unit in this area is SI. The magma is derived from the upper mantle and is melted and mixed with the earth's crust during the intrusion. The temperature of this sequenece diagenesis is 800～274.04℃;The diagenetic pressure is(4～0.7)×108 Pa. It is inferred that the initial crystal depth is 13 km and the depth of positioning is 7～10 km. Late unit positioning upwards, tending to shallow diagenesis.
引文
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[5]王仁民,贺高品.变质岩原岩图解判别法[J].地质出版社,1987.
[6]孙嘉,毛景文,姚佛军等.西藏多龙矿集区岩浆岩成因与成矿作用关系研究[J].岩石学报,2017,(10).
[7]王志畅,朱西养,汪云亮等.岩浆岩成因类型REE判别[J].铀矿地质,2004,(5).
[8]黄勇,丁俊,唐菊兴等.西藏雄村斑岩型铜金矿红柱石成因矿物学特征[J].地球学报.2012,(4).
[9]禹丽,李龚健,王庆飞等.保山地块北部晚白垩世岩浆岩成因及其构造指示:全岩地球化学、锆石U-Pb年代学和Hf同位素制约[J].岩石学报,2014,(09).
[10]段留安,杨晓勇,孙卫东等.安徽滁县琅琊山一带燕山期岩浆岩成因及区域找矿方向[J].大地构造与成矿学, 2012,(02).
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