Precipitation and diagenesis of hot spring deposits/Evolution of carbonate successions on isolated oceanic islands

温泉沉积物的降水与成岩作用/离岛碳酸盐岩层序的演化

• 批准号: RGPIN-2014-04246
• 负责人: Jones, Brian
• 金额: $ 2.7万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=654808
• 关键词: Precipitation; diagenesis; hot; spring; deposits

My research program will focus on (1) factors that control calcite, aragonite, and opal-A precipitation, (2) the role that microbes play in the precipitation of aragonite, calcite, and opal-A, and (3) the origin of pervasively dolomitized successons. Research goals 1 and 2 will be achieved by the detailed study of hot spring/geyser deposits, whereas research goal 3 will be based on the Tertiary dolostones of the Cayman Islands with comparisons being made to the Devonian dolostones of Alberta and Precambrian dolostones from China.**Hot Spring/Geyser Deposits: Over the next five years, attention will be focused on spring systems found in Yunnan Province in China. Tectonic activity in this area, related to the collision between the Indian and Eurasian plates, gives rise to numerous springs that are characterized by water temperatures up to 100°C, pH values between 2 and 9, and variable water compositions. As such they are ideal natural laboratories for assessing the factors that control mineral precipitation and the distribution of microbial mats. Information obtained from these springs will be integrated with data that I have already obtained from spring systems that I have studied in Iceland, New Zealand, the Kenyan Rift Valley, and western Canada. Although focused on spring systems, this research will focus on questions that are pertinent to all carbonate deposits - including, for example, the factors that control aragonite as opposed to calcite precipitation, the role that microbes play in precipitation, and the factors that control preservation of soft-bodied microbes. **Evolution of Tertiary dolostones of the Cayman Islands: This research will focus on the origin of the dolostones that form most of the Bluff Group (Oligocene - Pliocene in age) with the view of explaining how pervasively dolomitized successions originate under the low temperature and low pressure regimes near the surface of the earth. This study has important implications for the origin of dolostones of all ages and, in particular, the manner in which they evolve to become excellent hydrocarbon reservoirs. Over the next five years hypotheses developed from the Cayman dolostones will be tested against the bitumen-bearing Devonian dolostones in the Grosmont Formation of east-central Alberta and Precambrian dolostones from China. By examining dolostones of different ages and from different geographic locations it should be possible to identify commonalities that may then lead to a better understanding of the dolomitization process.

我的研究计划将集中在（1）控制方解石，文石和蛋白石-A沉淀的因素，（2）微生物在文石，方解石和蛋白石-A沉淀中的作用，以及（3）普遍的结晶化继承的起源。 研究目标1和2将通过详细研究温泉/间歇泉矿床来实现，而研究目标3将以开曼群岛第三纪白云岩为基础，并与阿尔伯塔泥盆纪白云岩和中国前寒武纪白云岩进行比较。温泉/间歇泉沉积：在未来五年内，将重点关注在中国云南省发现的泉水系统。 该地区的构造活动与印度板块和欧亚板块之间的碰撞有关，产生了许多泉水，其特征是水温高达100°C，pH值在2至9之间，水的成分可变。 因此，它们是评估控制矿物沉淀和微生物垫分布的因素的理想天然实验室。 从这些泉水中获得的信息将与我在冰岛、新西兰、肯尼亚裂谷和加拿大西部研究的泉水系统中获得的数据相结合。 虽然专注于泉系统，这项研究将集中在与所有碳酸盐沉积物相关的问题上-包括，例如，控制文石而不是方解石沉淀的因素，微生物在沉淀中的作用，以及控制软体微生物保存的因素。 ** 开曼群岛第三纪白云岩的演化：这项研究将着重于构成大部分海崖群（年龄为渐新世-上新世）的白云岩的起源，以期解释普遍的风化层是如何在地球表面附近的低温和低压条件下形成的。这项研究对所有年龄段的白云岩的起源，特别是它们演化成优质油气藏的方式具有重要意义。 在接下来的五年里，将对来自开曼白云岩的假设进行测试，以对比阿尔伯塔中东部格拉斯蒙组中含沥青的泥盆纪白云岩和来自中国的前寒武纪白云岩。 通过研究不同年龄和不同地理位置的白云岩，应该可以确定共同点，从而更好地了解白云石化过程。