西准噶尔白碱滩红山梁组硅质岩的地球化学特征、成因及形成构造环境-岩石矿物学杂志-CSCIED科技核心评价数据库-手机版

西准噶尔白碱滩红山梁组硅质岩的地球化学特征、成因及形成构造环境

Geochemical characteristics, genesis and tectonic setting of the siliceous rocks from Hongshanliang Formation in Baijiantan, Western Junggar

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DOI	10.20086/j.cnki.yskw.2025.4185
刊名	岩石矿物学杂志 Acta Petrologica et Mineralogica
年，卷(期)	2025, 44(3)
作者	王韬，李永军*，李海，付浩，郑孟林，黄家瑄，韩杨，徐淼,
作者单位	1. 中国石油新疆油田分公司勘探开发研究院, 新疆克拉玛依 834000; 2. 长安大学地球科学与资源学院, 陕西西安 710054; 3. 西安石油大学地球科学与工程学院, 陕西西安 710065; 4. 河北省煤田地质局第二地质队, 河北邢台 054500
摘要	红色硅质岩是西准噶尔包古图构造带晚泥盆世红山梁组的主要岩石类型,约占地层总厚的80%,研究其岩石地球化学特征,可揭示岩石成因、指示形成的构造环境,为区内晚泥盆世构造古地理演化研究提供新的沉积学信息。红山梁组上部硅质岩以红色-红褐色为主,层理不发育,多呈团块状、条带状,与火山熔岩共生或见于火山岩夹层中,未见海绵骨针; 中部硅质岩为红色,薄层状构造,层理发育,多见沉积纹层,海绵骨针丰富,与凝灰质粉砂岩、凝灰质泥质粉砂岩呈互层; 下部硅质岩见红色、灰色,岩相学与岩性介于上述两类,显示过渡性。上部与下部硅质岩相对低SiO₂(71.90%、87.48%)、CaO(1.45%、1.28%)、P₂O₅(0.09%、0.06%)和δEu,高TiO₂(0.57%、0.2%)、Al₂O₃(13.47%、5.54%)、MgO(1.80%、0.94%)、Na₂O(3.93%、0.64%)、K₂O(2.05%、1.14%)、Na₂O/K₂O(1.35、0.40)、Al₂O₃/(Al₂O₃+^TFe₂O₃)(0.74、0.71)和Sc、V、Cr、Cu、Zn、Sr、Y、Zr、La、Ce、Nd、Yb、Lu、ΣREE、Th/Sc、Th/U值; 中部硅质岩主量元素的含量及对应比值与之刚好相反,高SiO₂(91%)、CaO(2.14%)、P₂O₅(0.48%),低TiO₂(0.07%)、Al₂O₃(1.05%)、MgO(0.32%)、Na₂O(0.14%)、K₂O(0.14%)、Al₂O₃/(Al₂O₃+^TFe₂O₃)(0.37),显著贫在岩浆作用中相对富集的Sc、V、Cr等元素。相关比值及图解分析表明,本组火山作用由下到上经历了强→弱→强的变化过程。上部与下部硅质岩以火山成因硅为主,形成于靠近弧火山的弧后盆缘区,而中部硅质岩以生物成因为主,形成于火山休眠期的弧后盆地环境。
Abstract	The red siliceous rocks of the Late Devonian Hongshanliang Formation in the Baogutu tectonic belt, Western Junggar, are extensively developed, comprising approximately 80% of the total stratigraphic thickness. Studying its geochemical characteristics can reveal the genesis of the rock and indicate the tectonic environment, and provide new sedimentary information for the study of the Late Devonian tectonic paleogeographic evolution in the area. The upper siliceous rocks are predominantly red to reddish-brown, with poorly developed bedding, and mainly occur in massive or banded forms. They are often associated with volcanic lava or within volcanic rock interlayers, but no sponge spicules have been observed. The middle siliceous rocks are red, display thin-bedded structures with well-developed stratification, and frequently exhibit sedimentary lamination with abundant sponge spicules. These rocks are interbedded with tuffaceous siltstone and tuffaceous argillaceous siltstone. The lower siliceous rocks, which are red or gray, show transitional lithological and petrographic features between the two aforementioned types. The upper and lower siliceous rocks are relatively low in SiO₂ (71.90%, 87.48%), CaO (1.45%, 1.28%), P₂O₅ (0.09%, 0.06%) and δEu, and high in TiO₂ (0.57%, 0.2%), Al₂O₃ (13.47%, 5.54%), MgO (1.80%, 0.94%), Na₂O (3.93%, 0.64%), K₂O (2.05%, 1.14%), Na₂O/K₂O (1.35, 0.40), Al₂O₃/(Al₂O₃ + ^TFe₂O₃) (0.74, 0.71) and Sc, V, Cr, Cu, Zn, Sr, Y, Zr, La, Ce, Nd, Yb, Lu, ΣREE, Th/Sc, Th/U. The content and corresponding ratio of the major elements in the siliceous rocks in the middle are just the opposite, with high SiO₂ (91%), CaO (2.14%), P₂O₅ (0.48%), low TiO₂ (0.07%), Al₂O₃ (1.05%), MgO (0.32%), Na₂O (0.14%), K₂O (0.14%), Al₂O₃/(Al₂O₃+^TFe₂O₃) (0.37), and significantly depleted in Sc, V, Cr and other elements that are relatively enriched in magmatism. The correlation ratios and graphic analysis show that the volcanism in Hongshanliang Formation had experienced a strong→weak→strong changing process from bottom to top. The upper and lower siliceous rocks are mainly volcanogenic silicon, which are formed in the back-arc basin margin area near the arc volcano, while the middle siliceous rocks are mainly biogenic, which are formed in the back-arc basin environment during the volcanic dormancy period.
关键词	硅质岩；地球化学；岩石成因；构造环境；红山梁组；西准噶尔
KeyWord	siliceous rock; geochemistry; petrogenesis; tectonic setting; Hongshanliang Formation; Western Junggar
基金项目
页码	573-586

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王韬，李永军*，李海，付浩，郑孟林，黄家瑄，韩杨，徐淼. 西准噶尔白碱滩红山梁组硅质岩的地球化学特征、成因及形成构造环境 [J]. 岩石矿物学杂志. 2025; 44; (3). 573 - 586.

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