RRS James Clark Ross JR20050509 (JR123)
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RRS James Clark Ross (74JC) |
| Cruise identifier | JR20050509 (JR123) |
| Cruise period | 2005-05-09 — 2005-05-18 |
| Status | Completed |
| Port of departure | St. John's, Antigua and Barbuda |
| Port of return | St. John's, Antigua and Barbuda |
| Purpose | Research |
| Objectives | Between the 9th and the 18th of May 2005, fifteen scientists from various international research institutes and six technical crew from the British Geological Survey joined the RRS James Clark Ross and her crew for a scientific research cruise to discover what lies on the ocean floor around the volcanic island of Montserrat.
The Soufriere Hills Volcano, Montserrat, has been in a major eruptive period from 1995 to 2003. During this time more than half a cubic kilometre of magma has been erupted, making this one of the most significant volcanic eruptions of the last few decades. The 2003 Montserrat lava dome collapse event (12-13 July) is the largest documented dome collapse for any volcano in recent history. The dome collapse was the result of two years of continual lava extrusion. Collapse occurred over an 18-hour period wherein 210 million cubic metres of pyroclastic material avalanched into the ocean. Approximately 90% of the erupted material from the Soufriere Hills Volcano was deposited into ocean. Cruise JR123 of the RRS James Clark Ross aimed to find out how this material was deposited and distributed in the ocean. This was done by imaging and selectively sampling the ocean floor around Montserrat. The data acquired provides new information about the volcanic history of Montserrat and understanding the major geological processes that build volcanic islands. |
| Chief scientist | R Stephen J Sparks (University of Bristol School of Earth Sciences) |
| Cruise report |  (0.10 MB) |
| Ocean/sea areas | |
| General | Caribbean Sea |
| Specific | The cruise was focused around the island of Montserrat and the majority of the data was collected off the southeastern Montserrat coast. |
| Measurements | |
| Geology and geophysics | |
| Grab | Quantity: number of samples = 1 Description: Centimetre-scale Box Core sample taken (16deg46.45'N, 61deg59.46'W), of unconsolidated seafloor surface volcanic ash. Sampled for later geochemical, sedimentological and palaeontological study. (JR123_17_X) |
| Grab | Quantity: number of samples = 1 Description: Centimetre-scale Box Core sample taken (16deg34.30'N, 62deg05.22'W), of unconsolidated seafloor surface volcanic ash. Sampled for later geochemical, sedimentological and palaeontological study. (JR123_47_X) |
| Grab | Quantity: number of samples = 1 Description: Centimetre-scale Box Core sample taken (16deg44.09'N, 62deg20.57'W), of unconsolidated seafloor surface volcanic ash. Sampled for later geochemical, sedimentological and palaeontological study. (JR123_1_X) |
| Grab | Quantity: number of samples = 1 Description: Centimetre-scale Box Core sample taken (16deg53.49'N, 62deg03.99'W), of unconsolidated seafloor surface volcanic ash. Sampled for later geochemical, sedimentological and palaeontological study. (JR123_35_X) |
| Grab | Quantity: number of samples = 1 Description: Centimetre-scale Box Core sample taken (16deg37.95'N, 62deg17.66'W), of unconsolidated seafloor surface volcanic ash. Sampled for later geochemical, sedimentological and palaeontological study. (JR123_4_X) |
| Core - rock | Quantity: number of cores = 1 Description: 2.12m Vibrocore sample taken (16deg39.06'N, 62deg16.46'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_3_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 3.86m Vibrocore sample taken (16deg44.09'N, 62deg20.57'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_1_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 2.60m Vibrocore sample taken (16deg40.34'N, 62deg18.98'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_2_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 1.38m Vibrocore sample taken (16deg37.95'N, 62deg17.66'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_4_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 4.98m Vibrocore sample taken (16deg30.32'N, 62deg57.49'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_5_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 1.42m Gravity core sample taken (16deg30.99'N, 62deg58.01'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_6_G) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 4.75m Vibrocore sample taken (16deg30.99'N, 62deg58.01'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_6_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 2.13m Vibrocore sample taken (16deg32.00'N, 62deg58.01'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_7_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 3.71m Vibrocore sample taken (16deg33.51'N, 62deg59.49'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_8_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 3.50m Vibrocore sample taken (16deg34.80'N, 62deg00.55'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_9_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 3.30m Vibrocore sample taken (16deg35.64'N, 62deg01.35'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_10_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 1.65m Vibrocore sample taken (16deg37.64'N, 61deg57.70'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_11_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 3.15m Vibrocore sample taken (16deg38.44'N, 62deg01.84'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_12_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 1.32m Vibrocore sample taken (16deg42.95'N, 62deg05.86'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_13_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 0.70m Vibrocore sample taken (16deg43.00'N, 62deg04.90'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_14_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 2.20m Vibrocore sample taken (16deg44.60'N, 62deg04.80'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_15_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 4.30m Vibrocore sample taken (16deg46.50'N, 62deg05.00'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_16_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 3.23m Vibrocore sample taken (16deg46.45'N, 61deg59.46'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_17_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 3.32m Vibrocore sample taken (16deg40.41'N, 62deg01.69'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_18_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 3.48m Vibrocore sample taken (16deg41.60'N, 62deg02.80'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_19_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 3.70m Vibrocore sample taken (16deg42.59'N, 62deg03.40'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_20_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 2.71m Vibrocore sample taken (16deg43.16'N, 62deg03.08'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_21_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 2.05m Vibrocore sample taken (16deg43.78'N, 62deg03.88'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_22_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 1.76m Vibrocore sample taken (16deg43.82'N, 62deg07.10'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_23_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 1.50m Vibrocore sample taken (16deg44.10'N, 62deg05.99'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_24_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 3.03m Vibrocore sample taken (16deg44.47'N, 62deg05.12'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_25_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 2.12m Vibrocore sample taken (16deg44.10'N, 62deg04.95'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_26_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 2.00m Vibrocore sample taken (16deg43.37'N, 62deg04.36'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_28_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 1.32m Vibrocore sample taken (16deg42.66'N, 62deg04.16'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_29_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 2.83m Vibrocore sample taken (16deg43.20'N, 62deg03.44'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_30_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 1.74m Vibrocore sample taken (16deg43.14'N, 62deg02.79'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_31_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 3.85m Vibrocore sample taken (16deg43.69'N, 62deg02.20'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_32_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 2.62m Vibrocore sample taken (16deg45.01'N, 62deg01.01'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_33B_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 3.32m Vibrocore sample taken (16deg50.31'N, 61deg56.33'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_34_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 5.04m Vibrocore sample taken (16deg53.50'N, 62deg04.00'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_35_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 2.12m Vibrocore sample taken (16deg50.00'N, 62deg05.00'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_36_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 1.55m Vibrocore sample taken (16deg45.94'N, 62deg05.92'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_37_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 1.88m Vibrocore sample taken (16deg43.48'N, 62deg04.67'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_38_V) |
| Core - soft bottom | Quantity: number of samples = 1 Description: Only end of hole sample recovered (16deg41.68'N, 62deg04.25'W). (JR123_39_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 2.80m Vibrocore sample taken (16deg41.80'N, 62deg04.38'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_40_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 2.32m Vibrocore sample taken (16deg41.74'N, 62deg04.50'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_41_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 3.0m Vibrocore sample taken (16deg40.38'N, 62deg05.38'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_43_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 2.66m Vibrocore sample taken (16deg39.90'N, 62deg03.75'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_44_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 1.66m Vibrocore sample taken (16deg36.39'N, 62deg10.77'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_45_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 1.74m Vibrocore sample taken (16deg35.00'N, 62deg09.08'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_46_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 3.26m Vibrocore sample taken (16deg34.30'N, 62deg05.22'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_47_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 3.70m Vibrocore sample taken (16deg42.65'N, 62deg04.31'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_54_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 2.54m Vibrocore sample taken (16deg31.00'N, 61deg56.10'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_53_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 3.00m Vibrocore sample taken (16deg32.10'N, 61deg54.71'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_52_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 3.08m Vibrocore sample taken (16deg36.59'N, 61deg58.94'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_51_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 2.85m Vibrocore sample taken (16deg36.11'N, 61deg59.95'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_50_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 1.30m Vibrocore sample taken (16deg43.60'N, 62deg04.95'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_27_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 4.97m Vibrocore sample taken (16deg34.65'N, 62deg03.70'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_48_V) |
| Core - soft bottom | Quantity: number of cores = 1 Description: 2.40m Vibrocore sample taken (16deg35.17'N, 62deg02.42'W), of unconsolidated volcanic sediments. Sampled for later sedimentological, volcanological and geochronological study. (JR123_49_V) |
| Moorings, landers, buoys | |
| Physical oceanography | |
| Bathythermograph | 16° 42' 47" N 61° 12' 0" W — Expendable Bathythermograph (JR123 pre-XBT02); Water depth ~2500m, Cast length 1660m. Deployed 07/05/2005; Time 01:27. |
| Bathythermograph | 16° 39' 53" N 62° 10' 41" W — Expendable Bathythermograph (JR123 XBT03); Water depth 446m, Cast length 760m. Deployed 11/05/2005; Time 13:53. |
| Bathythermograph | 16° 53' 30" N 62° 4' 0" W — Expendable Bathythermograph (JR123 XBT06); Water depth 765m, Cast length 760m. Deployed 16/05/2005; Time 16:03. |
| Bathythermograph | 16° 43' 5" N 62° 6' 42" W — Expendable Bathythermograph (JR123 XBT05); Water depth 810m, Cast length 760m. Deployed 11/05/2005; Time 20:26. |
