{"id":2271,"date":"2025-03-25T03:23:32","date_gmt":"2025-03-25T03:23:32","guid":{"rendered":"https:\/\/confer.co.nz\/isc2026\/?p=2271"},"modified":"2025-10-03T03:49:03","modified_gmt":"2025-10-03T03:49:03","slug":"distal-sedimentation-from-large-volume-silicic-eruptions-in-a-regression-dominated-marine-environment","status":"publish","type":"post","link":"https:\/\/confer.co.nz\/isc2026\/field-trips\/pre-conference\/distal-sedimentation-from-large-volume-silicic-eruptions-in-a-regression-dominated-marine-environment\/","title":{"rendered":"Distal sedimentation from large-volume silicic eruptions in a regression-dominated marine environment"},"content":{"rendered":"\n<p><strong>Date<\/strong>: 22 \u2013 23 January 2026<br><strong>Leaders:\u00a0<\/strong><a href=\"mailto:szabolcs.kosik@gmail.com\">Szabolcs Kosik<\/a> and <a href=\"mailto:C.Rees@massey.ac.nz\">Callum Rees<\/a><\/p>\n\n\n\n<p>The Whanganui Basin (Aotearoa New Zealand) contains one of the most detailed late Neogene to Quaternary sedimentary records of climate change exposed onland anywhere in the world. Over the past 2\u20133 million years, this area recorded the dynamic interplay of glacio-eustatic sea-level change, regional tectonics, and sediment supply, punctuated by episodes of explosive volcanism from the central North Island. While the basin is widely recognised for its dominantly shallow marine stratigraphy, the role of volcanogenic sedimentation\u2014particularly tephra influx\u2014has increasingly been acknowledged as a significant driver in shaping both its stratigraphic architecture and geomorphic evolution.<\/p>\n\n\n\n<p>Volcanic activity associated with the Taup\u014d Volcanic Zone (TVZ), including the voluminous Kidnappers (1200 km<sup>3<\/sup> DRE) and Whakamaru (2200 km<sup>3<\/sup> DRE) eruptions, profoundly altered the landscape of the North Island. Following such cataclysmic events, drainage networks were disrupted and subsequently re-established, mobilising vast quantities of reworked pyroclastic debris through fluvial systems and into the Whanganui Basin. The volcanogenic sediments resulted in rapid aggradation of valleys, promoting river avulsion, and loading of coastal embayments. These processes, in turn, triggered soft-sediment deformation, slumping, and altered sediment dispersal patterns on the shelf. The basin\u2019s tephra-rich sequences thus provide a unique record of distal landscape response to supereruptions and the cascading sedimentary consequences of volcanism.<\/p>\n\n\n\n<p>During the late Pleistocene, the basin\u2019s evolution was increasingly shaped by regional uplift and climatically driven changes in sediment supply and base level, transitioning toward terrestrial sedimentation. This phase is marked by loess accumulation, fluvial aggradation and incision, and continued tephra input, further enriching the basin\u2019s complex stratigraphic history.<\/p>\n\n\n\n<p>Our field trip will explore this world-class Quaternary sedimentary record to unpack the interplay between sediment supply, uplift and sea level. We will also visit R\u0101t\u0101 Marae in the Rangit\u012bkei to learn about the special connection tangata whenua share with this area and witness the magnificent flights of river terraces preserved within the Rangit\u012bkei Valley. We will also provide a history of land use in the area and discuss how geology relates to erosion, presenting questions around land use management and sustainability.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"567\" data-id=\"2366\" src=\"https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-1-1024x567.jpg\" alt=\"\" class=\"wp-image-2366\" srcset=\"https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-1-1024x567.jpg 1024w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-1-300x166.jpg 300w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-1-150x83.jpg 150w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-1-768x425.jpg 768w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-1.jpg 1379w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/figure>\n\n\n\n<p>Figure 1: Aggradational river terraces are beautifully preserved in the Rangit\u012bkei River valley, highlighting the interplay between uplift, sediment supply and sea level over the last 350,000 years.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"704\" src=\"https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-2-1024x704.jpg\" alt=\"\" class=\"wp-image-2367\" srcset=\"https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-2-1024x704.jpg 1024w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-2-300x206.jpg 300w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-2-150x103.jpg 150w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-2-768x528.jpg 768w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-2.jpg 1377w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Figure 2: Lenticular, flaser and wavy bedding. Note soft sediment deformation\/loading structures exposed in interbedded silts and sands of the Waitapu Stream, Rangit\u012bkei Valley.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"603\" src=\"https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-3-1024x603.jpg\" alt=\"\" class=\"wp-image-2368\" srcset=\"https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-3-1024x603.jpg 1024w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-3-300x177.jpg 300w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-3-150x88.jpg 150w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-3-768x452.jpg 768w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-3.jpg 1274w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Figure 3: Exquisite ripples preserved within reworked pumiceous sediments of the Kaimatira Pumice Sand Formation (1 Ma), R\u0101t\u0101.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"553\" src=\"https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-4-1024x553.jpg\" alt=\"\" class=\"wp-image-2369\" srcset=\"https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-4-1024x553.jpg 1024w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-4-300x162.jpg 300w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-4-150x81.jpg 150w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-4-768x415.jpg 768w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-4.jpg 1379w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Figure 4: Beautiful scenery and river terraces of the Rangit\u012bkei Valley, Ironworks Road, Ohingaiti.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"463\" src=\"https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-5-1024x463.jpg\" alt=\"\" class=\"wp-image-2370\" srcset=\"https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-5-1024x463.jpg 1024w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-5-300x136.jpg 300w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-5-150x68.jpg 150w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-5-768x348.jpg 768w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-5.jpg 1379w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Figure 5: Waitapu cross-bedded pebbly shell conglomerate exposed in Waitapu Stream, Rangit\u012bkei Valley.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-6-1024x768.jpg\" alt=\"\" class=\"wp-image-2371\" srcset=\"https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-6-1024x768.jpg 1024w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-6-300x225.jpg 300w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-6-150x112.jpg 150w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-6-768x576.jpg 768w, https:\/\/confer.co.nz\/isc2026\/wp-content\/uploads\/2025\/03\/ISC2026-Field-trip-6.jpg 1379w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Figure 6: Trough cross bedding preserved within Kaimatira Pumice Sand Formation (1 Ma), Potaka Station, Rangit\u012bkei Valley.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Date: 22 \u2013 23 January 2026<br \/>\nCost ($NZD inc 15% GST): $540 per person<\/p>\n","protected":false},"author":1,"featured_media":2366,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,11],"tags":[],"class_list":["post-2271","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-field-trips","category-pre-conference"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Distal sedimentation from large-volume silicic eruptions in a regression-dominated marine environment - ISC2026<\/title>\n<meta name=\"description\" content=\"Date: 22 \u2013 23 January 2026 Cost ($NZD 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