tholeiitic

The most common of these series are tholeiitic, calc-alkaline, and alkaline.

The field is made up of 58 Pleistocene-Holocene tholeiitic cones.

They have a tholeiitic chemistry, consistent with intrusion into a rift setting.

As a result, much of the basin floor is made of tholeiitic basalts giving its brown colour.

Alkaline and tholeiitic volcanic activity is associated with this rifting event.

It is a pile of tholeiitic pillow basalts and breccias.

Because the Moon is extremely reduced, all of its basalt is tholeiitic.

Coarse feldspar-bearing, iron tholeiitic basalts are more common east of Highway 11.

They are composed of either tholeiitic olivine or picritic basalt.

Tholeiitic basalt is relatively rich in silica and poor in sodium.

The definition varies, but it is generally considered as being 1 part tholeiitic basalt and 3 parts dunite.

These tholeiitic basalts form a volcanic mountain range known as North Mountain.

Some of the oldest rocks are submarine tholeiitic basalts from the Eocene era.

The composition of the lavas varies from tholeiitic basalt to rhyolite.

It is a 201 million year old sequence of tholeiitic basalts, which contains columnar jointing.

Scolecite, Stilbite and abundant zeolite in the tholeiitic basalt are reported.

The tholeiitic shields tend to be wider and shallower than the picritic shields.

Tholeiitic rocks may have a fine, glassy groundmass, as may other types of basalt.

The eruption were explosive tholeiitic andesite and dacite.

The augite contains significantly greater titanium, aluminium and sodium than that in typical tholeiitic basalt.

The Crimson Creek Formation consists of greywacke with tholeiitic basalt.

This helped another project goal, to recover a suitable and datable chunk of tholeiitic lava, which appeared to be rare on the seamount.

Eruptions of tholeiitic and some calc-alkaline basalts are the oldest recognised units derived from the volcano.

The basic volcanic rock deposited in between is mainly made up of melaphyre, andesite, tholeiitic basalt and cuselite.

It consists of tholeiitic mafic and subordinate felsic volcanic rocks that were erupted in a submarine environment about 2706 million years ago.