Characteristics of the mixed carbonate deposit of Brigadier Formation in Northern Carnarvon Basin, Australia and its depositional model
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摘要:
Northern Carnarvon盆地晚三叠世—早侏罗世发育一套海相Brigadier组碳酸盐岩，但其岩性特征、沉积相类型、分布规律和沉积模式尚不清楚。研究认为，Brigadier组沉积时期构造稳定、基底坡度小、气候温暖潮湿、海洋生物种类繁多、海平面整体上升，具有利于混积沉积发育的地质背景。Brigadier组具有明显的混积沉积特征，盆地东南部Brigadier组岩性为三角洲砂泥岩，盆地西北部岩性为纯碳酸盐岩，ODP多口钻井钻遇生物礁滩沉积，整体呈现从东南向西北岩性由碎屑岩变成碳酸盐岩的特征。研究认为Brigadier组混合沉积形成的主要原因是碎屑物源输入的停止和水动力的减弱，导致碳酸盐岩沉积与砂泥岩沉积出现混合，Brigadier组混合沉积为典型的相混合成因类型。
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关键词:
- Northern Carnarvon盆地 /
- Brigadier组碳酸盐岩 /
- 混积沉积特征 /
- 混积沉积模式
Abstract:The lithology, sedimentary facies, and distribution pattern of the Brigadier Formation of the Late Triassic remain unclear up to date in the Northern Carnarvon Basin of Australia. Studies suggest that during the time of Brigadier Formation, the region was a stable gentle basement slope tectonically under a warm and humid climate and rising sea level, which is favorable to the growth of marine lives. All the conditions are conducive to the formation of the mixed carbonate of the Brigadier Formation. The Brigadier Formation is characterized by a deltaic sand-shale sequence in the southeastern part of the basin, while the northwest part of the basin is dominated by pure carbonate rock deposits. From the southeast to the northwest of the basin, the Brigadier Formation changes from clastic deposits to carbonate. Mixed deposits were then formed when the input of clastic debris decreased and the environment became weaker in water dynamics.
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表 1 钻井岩性矿物含量统计
Table 1. Lithology of some drilling wells
井名 深度/m 砂岩、粉砂岩含量/% 颗粒灰岩含量/% 泥晶灰岩含量/% 泥岩含量/% Vinck 1 2725~2775 0 18 39 43 Sirius 1 3005~3100 5.8 10.56 83 0.56 Investigator 1 3300~3365 4.2 11.5 60 24.3 
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