{"id":26528,"date":"2024-10-22T10:04:49","date_gmt":"2024-10-22T02:04:49","guid":{"rendered":"https:\/\/www.curtin.edu.au\/news\/?post_type=media-release&p=26528"},"modified":"2024-10-22T10:04:54","modified_gmt":"2024-10-22T02:04:54","slug":"drowning-continent-study-confirms-perth-coastlines-complex-history","status":"publish","type":"media-release","link":"https:\/\/www.curtin.edu.au\/news\/media-release\/drowning-continent-study-confirms-perth-coastlines-complex-history\/","title":{"rendered":"\u2018Drowning continent\u2019: Study confirms Perth coastline\u2019s complex history"},"content":{"rendered":"\n

A new Â鶹ֱ²¥ study<\/a> investigating the complex evolution of two iconic Western Australian landmarks, has traced their transformation over thousands of years and offers a glimpse into their future.<\/p>\n\n\n\n

Researchers from the Timescales of Mineral Systems Group in the School of Earth and Planetary Sciences collected sedimentary samples from multiple locations along Perth\u2019s coastline, waterways and even the sea floor to track changes which occurred as the ocean levels rose dozens of metres over thousands of years.<\/p>\n\n\n\n

Study lead Dr Andreas Zametzer<\/a> said the study\u2019s dive teams found particular types of mineral grains offshore, which confirmed the complex geological histories of Rottnest Island (Wadjemup in the Noongar language) and the Swan River (Derbarl Yerrigan).<\/p>\n\n\n\n

The distinct group of ancient grains off Rottnest Island was dated as up to 3.6 billion years old.<\/p>\n\n\n\n

These same grains can be traced into the modern Swan River estuary and the Avon River tributary which had delivered and deposited them thousands of years ago.<\/p>\n\n\n\n

\u201cPerth is sitting on a continental margin that is drowning,\u201d Dr Zametzer said.<\/p>\n\n\n\n

\u201cRottnest Island used to be the tip of a peninsula until about 6500 years ago \u2014 similar to what we see in the Shark Bay region \u2014 and because it’s still part of the drowned continental margin, the ocean between Perth and Rottnest is hardly deeper than 20m in most places.<\/p>\n\n\n\n

\u201cWe also now know for sure the mouth of the Swan River used to be north of where Rottnest is today.\u201d<\/p>\n\n\n\n

Dr Zametzer said the researchers were stunned to find the ancient, river-transported mineral grains so far out to sea.<\/p>\n\n\n\n

\u201cWe would have expected the grains to have eroded and washed away because they were in a very turbulent, high-energy environment of waves and tides,\u201d he said.<\/p>\n\n\n\n

\u201cBut the distinctive mineral fingerprints of the river are still sitting there despite thousands of years of sea-level changes and shelf reworking.<\/p>\n\n\n\n

\u201cWe have this river system imprint preserved offshore, confirming the coast\u2019s history.\u201d<\/p>\n\n\n\n

Dr Zametzer said it was important to learn how coastlines have adapted and changed in the past to help understand what rising sea levels will mean in the future.<\/p>\n\n\n\n

\u201cIt\u2019s quite shocking to think about how fast some geological processes actually happen with sea levels continuing to rise quickly.\u201d<\/p>\n\n\n\n

\u2018When the river meets the sea: Transport and provenance in a long-lived estuary\u2019 <\/em>was published in Basin Research<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

A new Â鶹ֱ²¥ study investigating the complex evolution of two iconic Western Australian landmarks, […]<\/p>\n","protected":false},"author":4457,"featured_media":26529,"template":"","meta":{"_acf_changed":false,"_oasis_is_in_workflow":0,"_oasis_original":0,"_oasis_task_priority":"","_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"4592,8558,6582,7077,4610,4817","_relevanssi_noindex_reason":"","wds_primary_category":0,"wds_primary_research-areas":0,"footnotes":""},"categories":[91,81,41,284],"tags":[],"research-areas":[],"class_list":["post-26528","media-release","type-media-release","status-publish","has-post-thumbnail","hentry","category-climate-change-and-conservation","category-earth-science","category-environment","category-science-and-engineering"],"acf":{"experts":false,"post_options":{"":null,"additional_content":{"title":"","content":"","image":false},"related_courses":[{"title":"","qualification":"","link":"","description":"","faculty":""}],"credits":{"author":"","photographer":"","media":[22646,24381]},"display_author":true,"banner":{"image":false}}},"featured_image":"https:\/\/www.curtin.edu.au\/news\/wp-content\/uploads\/2024\/10\/Rottnest_Island_coastline_near_Parker_Point_01-1000x500.jpg","author_meta":{"first_name":"Sam","last_name":"Jeremic","display_name":"Samuel Jeremic"},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/media-release\/26528","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/media-release"}],"about":[{"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/types\/media-release"}],"author":[{"embeddable":true,"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/users\/4457"}],"version-history":[{"count":0,"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/media-release\/26528\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/media\/26529"}],"wp:attachment":[{"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/media?parent=26528"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/categories?post=26528"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/tags?post=26528"},{"taxonomy":"research-areas","embeddable":true,"href":"https:\/\/www.curtin.edu.au\/news\/wp-json\/wp\/v2\/research-areas?post=26528"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}