768 



SUBANTARCTIC ISLANDS OF NEW ZEALAND. [Soils and Soil-formers. 



Basalt peom Gamp Cove, Atjckland Island. 





K752. 



Weathered 



Eed 



Exterior 



Portion. 



K 752a. 



Unweathered 



Dark-grey 



Basalt. 



K799. 



K800. 



■ 

 K801. 



K802. 



Possession 

 Island 

 Basalt. 



Water 



8-32 



0-11 



6-20 



2-55 



4-26 



2-81 



2-34* 



Silica 



42-36 



55-75 



52-35 



46-80 



52-95 



49-60 



45-61 



Calcic oxide . . 



2-60 



4-30 



3-32 



6-00 



3-05 



5-05 



6-34 



Ferric and ferrous oxides 



9-11 



14-76 



4-95 



16-20 



5-40 



14-99 



13-46 



Titanium-oxide 



2-11 



0-75 



5-10 



2-45 



6-20 



2-81 



3-48 



Magnesic oxide 



1-86 



0-54 



0-36 



1-47 



0-20 



1-87 



4-84 



Manganese -oxide 



0-20 



0-20 



0-06 



0-11 



0-04 



0-09 



Trace 



Sodic oxide . . 



4-53 



5-90 



8-01 



5-95 



7-95 



4-51 



5-06 



Potassic oxide 



2-43 



2-23 



1-75 



2-01 



2-76 



2-95 



2-67 



Alumina 



26-48 



15-03 



17-80 



15-90 



16-94 



14-70 



15-70 



Phosphoric anhydride . . 



Trace 



-0-77 



0-52 



0-79 



0-67 



0-86 





* On ignition. 



K 752a and K 3005 are very high in alkalis and low in lime for basalts. 



K 752 and K 752a are from a basalt boulder weathered by sea, from the beach 

 at Camp Cove boat-depot. The exterior scale was hard, red, and polished, and 

 extended for | in. into K 752a. 



The Possession Island (Victoria Land) analysis is that of a basalt collected 

 from that locality by the Ross expedition, and analysed by Prior (32). 



J 799 and J 800 are weathered and unweathered basalt collected on the 23rd 

 November, 1907, from the littoral at Camp Cove, Auckland Island ; taken under a 

 humus soil. 



J 801 and J 802 were taken near the same locality on the same date. 



These analyses show the effect of the humus soils in weathering basalt, plus 

 the action of a certain amount of sea-salts which would drain through the soil in 

 such a situation. 



Basalt from Auckland Island. 







J 833a. 





1 



1 





Weathered 

 to a Pink 



J 833b. 

 Unweathered. 



656. 



K2999. 





Powder. 









Silica 



72-20 



45-85 



42-14 



44-55 



Alumina 







13-65 



13-10 



14-95 



15-45 



Ferrous and ferric oxides 





1-50 



14-94 



12-61 



15-60 



Titanic oxide . . 





2-70 



4-10 



4-90 



3-70 



Calcic oxide . . 





0-55 



9-92 



10-32 



8-81 



Magnesic oxide 





0-13 



6-69 



9-47 



5-40 



Manganese-oxide 









0-09 



0-12 



0-11 



Sodic oxide . . 







6-66 



3-45 



3-27 



3-18 



Potassic oxide 







2-97 



2-02 



1-80 



1-80 



Phosphoric anhydride . . 







Trace 



0-11 



0-40 



0-64 



Loss at 100° C. 







0-33 



0-20 



0-28 



1-26 



